fuking seriously man ! pay for a dyno run, they are there to measure hp. or look at the 100000000000 other "how much hp" threads there are, no doubt some one else with the same mods as you has asked 1000 times before.
vforce are good for flow , say for upper rpm and bigger motors, the stockers are stock, but with some cage porting and aftermarket reeds, they can flow quite well.