I must be getting old, sorta over V8's and the current exhaust sounds like a v8 so no point doing it just for the sound...hahaha   Gunna go 2v 250, I've got all the decals and badging to suit as well, maybe one day I'm might get hold of a clevo and drop in it.   Right now just want to get the XB's straight line performance close to my G6 (which is 228rwkw's according to Tunehouse racings dyno.). I'd be over the moon if I can get the XB to nudge a 13...

I'd keep the vinyl roof, it's just awesome as it left the factory.  If you decide later on to spice it up with a Clevo, it all just slips in.....

i'd keep it stock, (with a 5 speed though) but, I'm old now.   

Hmmm given the low inlet flow rates of the log head (145cfm with porting) it'd be pretty low powered anyway I think.     Custom manifold on the 2v head would work a lot better,  but it'd be cheaper to do a triple dcoe weber style efi setup with that.   Hmmm can always dream of stupid but cool things ford six related.

someone may already do a triple throttle body setup, but most would just go the 4 barrel below
  https://www.ebay.com.au/itm/163422319601

you wouldn't do that with a triple set up, i''d expect they'd be flow benched to be fairly even, and likely be better on fuel on a stock engine as is with better power and response. 

https://www.efihardware.com/products/2883/Pro-Race-Mazda-20B-ITB-Kit-with-130160-Spacing   Ditch the manifold and run a custom fuel log, this could be bolted to a tri power style log head.    I wonder if a Haltech could be programmed to run the middle injector at low and medium throttle and the kick the other 2 in at wide open throttle, just like how the carb setup works.

That is awesome, going to look into that one for sure

there's a NZ based forum that has a lot of custom stuff.. here's the DIY Fuel Injected Thread 
(note, if you join there,  read the rules, you can't post in their project threads, they have a separate "discussion thread" also have an intro thread like we have here but it's one continuous thread for each person to post after the next) 
https://oldschool.co.nz/index.php?/topic/34850-diy-fuel-injection-thread/page/121/#comment-2715941

3 ITBs from something that measures up to the right cubic inches would be kind of cool. 
few guys over there doing custom 3D printed in plastics or metal adapting e throttles to custom engine builds. 
no idea what's in that EFI thread, but no doubt whatever you've thought of and what you'd never think of would have been discussed/discovered in it. 

Hmmm maybe just plug up the middle hole and run 2 of them similar to the old Holden 179 X2 red motor with the twin strombergs.   Could poke a pair of 5 inch chrome aircleaners out of the bonnet like a tunnel ram.