My Performer intake & Eddy 600 combo is perfect for my driver car.
Two things:
1) There will be a pin sticking up at the rear intake valley mating surface (in the block) that will need to be pulled out with pliers. The performer intake doesn't have the little hole for the pin to slide into that the stock intakes have.
2) Make your intake gasket out of the grey permatex from the parts store. A replacement intake gasket (fel-pro, etc) doesn't seal well with the performer. Run the permatex in a SMALL bead (think "like drawing with cake icing") around the ports and intake bolt holes with the intake upside down. Then lay a bead of permatex across the front and back of the block (at the valley) about as thick as your pinky. Gently drop the intake straight down on top and make sure there is enough permatex so that there aren't any leaks when the intake and block meet for the first time.
Also, scrape the old intake surface clean with a razor blade, and wipe all mating surfaces with acetone.
