Heads/intake/carb/cam all need to be a matched combo for optimum performance.
If you put a .7 lift with 3 duration cam, you are running a very aggressive cam that won't make power for you until high RPMs, if you match with stock heads, crappy intake, and too small of a carb you get a dog. A lot of people do this and then piss and moan that they have all this 'stuff' on their car but run 15s at the track
You need to pick all your compoments to operate in the same general RPM range and flow similar CFMS...just like a 1050 CFM carb on a stock 289 headed motor, a huge cam on a stock headed motor is also wrong.
For what its worth, the performer is a nice intake for a mild build...but it pretty much dies at 4500 so there are not too many more aggressive cams out there that you will be able to run without swapping at the very least the intake.