Which intake do I use?

On the subject of a cam, you might want to make certain that you have a cam that would maximize power in the RPM range you desire. The proper cam would have alot more impact on low-midrange torque than the difference between those two intakes and whether or not you have a spacer( which in general help higher RPM power). If you have the intake off your halfway to installing a new cam. Purple shafts are fine cams but not exactly cutting edge technology.