For a TPI swap these days I'd not use the factory ecm(orig ones the boards can crack and then have issue when hot, ask me how I know) and the old brittle harness(C4 Corvettes get hot under the fiberglass hood). FAST has a retro EFI kit or Holley has a TPI kit, both are harness, ecm and some sensors I think. Both are self learn but programmable somewhat, think the holley is more. I've done a bit of research because if you mod Anything(efi or carb) you should tune and swapping into a different vehicle is a mod technically.
I want one of those setups for my 1986 C4 corvette with TPI and if I didn't already have TPI stuff from my 1985 TA(Like a reman ecm when I upgraded from the one year 85 to the 86-up ecm and then used it to replace the cracked C4 one), that I used on it I'd prob go with a different efi setup. Still the cost of those systems you might wanna consider something else depending on your purpose. Fitech has some nice compete kits.
The biggest downfall to TPI is the 180 turn from plenum into the lower intake, at high rpm the velocity of the air is high enough it can't turn and the air gets in its own way. I've watched two porters figure this out for themselves before ditching the intake and going another route, one was a good pro. Everyone says long runner blah blah blah, nope it's the 180 turn. Look at any of the aftermarket intakes that competed with TPI like the superram, expanded the plenum and shortened runners into 90 deg turn.
I like the TPI but I mod to compliment it, not try and make it do what it can't.
If you choose to wire it up yourself check out Speedway Motors, they may have a kit that'll save you some. GL thirdgen.org and corvetteforum.com C4 section will be helpfull with lots of TPI info.
