Who's tbi adapter works the best? I've used the search function, but i'm still not sure which one to buy. Thanks for any suggestions. Paul

 

Mine came from Howell Enginering?

 

I used a Holley piece, and it was just fine. I think the best is actually the factory GM piece that came on the late 80's 454 engine. It was a quadrajet to TBI adapter and positioned the throttle plates at the optimum point. You can adjust any of them you get if you need to by grinding/slotting a little where the bolt holes go the manifold...