Ok, coming back to the clearance problem. In my readings about changing from Xfire to carb, I did read that a Performer would fit, however an 'Air Gap' would not (Too high) and that depending on the carburetor heigth and what aircleaner. The aircleaner needed to be a drop down style and the shortest filter available. Still there were some that had clearance problems and had to trim the inside of the hood slightly. But I gathered it wasn't much trimming, and that it wasn't visible on the outside. I think to answer your question, yes that is about the only manifold other than stock Camaro manifolds that fit due to heigth. Do some search in FI to Carb threads, I think you will find what info you will need to do everything. Also remember something about linkage, but these were all GM factory parts pieced together.