[hardline_42]

WayFast, I researched all of this stuff and got most of the way there before I decided to go carbed on my Vortec 406. If you want power gains, don't go for a factory TPI system. They tend to run out of breath quickly. If you want simplicity, go for a TBI system. You can get a TBI throttle body from a later model 454 that will feed the 400 just fine. Same caveat as the factory TPI applies. My choice was the Holley Stealth Ram for Vortec heads. I tried pieceing it together using an ECM from a late 3rd gen, but I would suggest just buying the whole kit.

I just wanna make it clear that the only reason I was switching to EFI was because at the time my '81 was going to have to function as a daily driver and I wanted something more fuel efficient and reliable in the winter, not for performance gains. Since I have my 4th gen DD now, I went back to the carb.