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.

https://www.classicindustries.com/product/of5970.html?srsltid=AfmBOopJShH31UIiGYpH4-SrAuCLskDieL5qujshMkkFtBx9am8jzxsp   I wonder how this would go on the log head with triple holley sniper 1100's on it...I guess you'd have to slave the 2 outer TB's to the middles ECU to stop the ECU's from clashing.   Would be a very interesting setup indeed...guess I'd have be a guinea pig for this sort of setup.

I reckon it'd be fine with a 250hp 4.1 litre, I doubt it'd go past the 300lb torque limit.   Not overly fussed, it's only a temp box to save me from the 3 speed...I really dont understand what people where thinking when they invented column shift manuals...  

you'd have to ask the people running turbo e series i guess.    they are fine behind 351s without getting abused, mate of mine had one in his XE with mild 351 and 3.45 diff,  not sure if the E series T5 is much different strength wise, but another mate has one in an XH 5 litre and it's done probably 20 1/4 mile runs and 250,000kms no issues without getting rebuilt.    i'd be interestest to know what's different about a T5z the turbo barra came with (strength wise)     

define "fair amount of power"?   would it handle 250hp and maybe 400nm NA or 350hp and 500nm+ with a turbo?   I'm not planning on drag racing the car or anything like that but it may get the odd back road run every now and then....wayyyy to many coppers out this way to be silly buggers.

if you rebuilt it before breaking it, or it's in good condition to begin with, it will handle a fair amount of power.  the V6 commo input shaft bearing is supposed to be an upgrade, but i don't know how it's fitted (is it full box teardown etc?)

I measured up the input shaft its the 6 cylinder one 167mm, the V8 one would of been 20mm longer if I remember correctly.   Doesnt really matter at the end of the day...a T5 is a T5, it'll break once I put some power through it....wish I could be as certain on winning lotto.