i have a chance to buy a vortech supercharger and i was wondering what kind of gains i could expect from this..my block and heads are stock as far as i know, i have a vortech intake,24lb injectors,exuast,65mm TB,75mm mass air,k&n,no air or smog,underdrive pullies, and 4.10s...do you think i would be better off putting the supercharger on or buying a head/cam combo...the vortech has a 12psi pulley...what kind of horsepower gains would i get from each?