I had a stock 340 factory intake which is similar to a Performer and was using it with a 650 Holley DP and liked the combo-very streetable-and it had heat crossovers which helped the driveability. It had a mild cam in the old engine . My new engine has an air gap which is good with my much bigger cam but it should be noted is not as driveable cold and has caused some tuning revisions because of the longer runners and lack of heat passages. Guess it depends what your end goal is Everything has a trade off Hope this helps
