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As for firing order I believe there was a concern that the frontmost cam bearing was copping too much of a flogging, what with the chain and firing order and all. So they changed it to the 351 order with the next major redesign and that was that.

Nice one mate, an original carb would be worth running on it even just for simplicity sake. I wouldn't use a 350 Holley as they are really only a 250cfm job by 4bbl rating standards, and the 500 is a 375cfm by that measure. Check for yourself and you'll see the 500 has the same venturi diameter as a 750cfm 4bbl. I've used 350's on Ford 250's and Chrysler 245's and they don't work too well there, needing substantial rejetting and tweaking. If you can get a 500 go for that, otherwise a 4bbl with an adaptor would be better than a Holley 350. - boingk

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ok i bought the motor ,and found out its a DIF casting for dearborn foundry ,see picture maybe gerg can work out the casting date,look to me like 1e20 if thats correct its a first cab off the rank and 10.2.1,i took the air cleaner home,has nice vac original dizzy on it too,the seller said dont tell me too much about the engine or the price is going up so action man slapped the cash down.

Ah, right you are. Probably won't matter to much in that case. If you're super anal about it you could trim them but if the main overlap is in the head to manifold water passage you should be fine from both a leak and performance point of view. Mind you if you've got the correct ones coming in I'd wait for them. Hell, you paid for them right? Unless you want to do an intake swap in the future, then use the current ones and stash the proper set.

I'd go the ones in the top picture, the ones that clear the ports a bit all around, looks like they fit better especially around the coolant passage. I haven't dealt with wet manifolds before but presume you want a pretty good seal there to save leaks and stuffing around later.

The only "knockoff" of them was the Holley 2010 and 4010 series, which were an evolution of this design. The Summit brand carby is the latest rehash, still selling well for price and out-of-the-box running. I wouldn't baulk at using one. I had a 600 Vac 4010 and it was pretty good. Just that the aluminium body would act like a pot on a stove. Hot days were a shit. Sent from my CPH1903 using Tapatalk

Your roller cam firing order is the same as a Clevo or "Mustang", ie: 13726548. The earlier one was phased out in the 80s (for some reason they kept it until then) but all other Ford smallblocks (351W/351C/400/4.6/5.4 Modular) use the later one. Beats the fuck out of me, but reasons I guess. That Motorcraft carby would be a better one to use than a 350. They are near bulletproof, and have annular boosters vs standard ones in the Holley. Probably rated at a similar CFM anyway. Sent from my CPH1903 using Tapatalk

Those ears look like they locate on the post in front of the choke horn on the Motorcraft carby. The 2 barrel that would have come with this engine is basically the front half of the 4 barrel carby you got from the wreckers Sent from my CPH1903 using Tapatalk

Yeah don’t use that firing order. Sent from my iPhone using Tapatalk

I’d be interested to see how that goes, it’s quite surprising how much carb these little things can take. When I was shopping around for a carb for mine the consensus was the usual 600cfm vac sec, but it never really ran right. Thinking it was too big went down to a quick fuel 450 dp and it was better in the idle to mid range and then went flat. Took a gamble on a new Quick fuel 650dp and basically straight out of the box it was mint. Tuned it using the wide band afr and it starts easy, revs crisp as hell and has steady afr right up to 6500. Sent from my iPhone using Tapatalk

Lookin' good matey! You going to see how she runs just like that? I'd be pretty tempted so long as the carby's up to scratch, or swap out for a 2bbl 500 if you have one handy.

I just battled 3 hrs traffic to grab this 1970 mustang 302 manifold n carby the add said just manifold but the guy gave me the lot carby been reco too Sent from my SM-G570Y using Tapatalk

Ok, going by a site I found, it's a 20th May, 1971 casting. Sent from my CPH1903 using Tapatalk

well the tmeyer website says first letter is year and 1 is 1971

I would have to look up a code cracker for that one Chestnut, more easily relateable for me is the block part number (ie: D1AE.... etc). Sent from my CPH1903 using Tapatalk

Nice one mate, it's its a 10.2 you're cheering, re ring and bearing and stab a camshaft in her while you're at it! I can hear it now, with that Action+ on it and an E-907-P...

Might have to apply some heat to it. I’m sure we pressed the steel gear on to the dizzy for mine. Sent from my iPhone using Tapatalk