BO185, dude, you are waaaaaaay off on that line of thinking.
If I'm gonna bash something it will be blatantly obvious to everyone, if I wanna start something everyone will know it, so throttle back & reread the post. You may note there's some humor inserted here & there for that exact reason. As it stands you are more than welcome to ask the mods to have a peek if you feel I've commited some greivioous offense.
Back to the topic at hand though,...
You asked why spend the kind of money a custom ECU like the Megasquirt or SDS when you can use OEM form another vehicle, I answered YOUR qeustion with MY reasoning.
And since I'm more interested in the actual EFI swap subject than anything here's a lil more reasoning go along with the subject.
I'm all about using EFI, I put a system on the 350 in my '65 3/4 ton Chevy and loved it. I did a full conversion with a Holley Pro-Jection system running a 650cfm 2bbl TBI on top of a Eddelbrock Peformer intake. Custom stainless fuel lines, modified tank, all the bells & whistles, only thing I didn't have was a MAF & an O2 sensor. And man, it flat out screamed. Pulled hard from idle to WOT & was a breeze to tune at rest or on the fly with no computer needed. It even got better emissions than new cars, and with no smog equipment, I loved it.
My point in saying what I did is I have seen many people make junk-yard EFI systems work, but playing the devils advocate here, I have also seen just as many suffer from problem after problem because the ECU just doesn't work with the engine it's on. Can quickly tunr into a nickle & dime ya to death expereince.
EFI, especialy a closed loop system with full sensors is far superior to carbs, always will be, but only if it works. Is a tunable ECU a better way to go with mismatched parts? Of course, but I'm not saying it's the ONLY way, not by far.
1956 GMC 370 dump " 'Tater "1970 VW Volksrod "the Black Bomber"
2007 Chevy Avalanche
2020 Jeep Cherokee Trailhawk,
2005 Harley Davidson FLHTCUI
I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P