The Holley Pro-jection manifold is meant to work with their TBI unit. It will move the GM unit forward and force you to do some modifying to get your cables and pipes to reach.
I'd go with the Weiand ...should give you a bit more top-end potential than the Performer (and you won't loose any bottom end).
Honestly, I wouldn't go with either one. TBI can handle a bigger plenum than either one of those manifolds has. A Performer RPM style is nice, and a lot of people like single plane manifolds for TBI. ...but if you're sticking with a mostly stock set-up, then the Weiand and Performer will be more than adequate. |