OK, I know I'm four years late with this but here's what I'm up to. I race Outlaw Sportsman in New England. I have a SBC TBI engine I want to put a 2 barrel Holley on. After a few days of Internet research, it looks as though Holly is the only place to get an adapter manifold. Their price isn't too far out but I'd prefer to just get an adapter plate. Anyone know if such an animal exists?just to illustrate my redneck ness... i have done what you want to do... i drilled the TBI intake for a 2 barrel Mr Gasket adapter... and you have to run a small diamter (like points) distributor if you cannot stand points (wimp ) then you can use the points to trigger a MSD 6a box... that way they never burn up..
be careful marking and drilling the intake, you WILL hit water, so seal the threads up good.
my motor craft 2 bbl on the burban works a HELL of a lot better than whatever computer failure was keeping that thing so pig rich.
and I am GM factory trained and certified, so dont think i just gave up, you ahve to for out big money for tools if you want to fix an EFI motor
and if you are gonna run EFI, then someday you will have to FIX it...