300 is just a number anyway, the car WILL run better with the cams and make more power and sound better. Plenty of guys making more power on the dyno and losing in a race because of gearing, other mods, tune or the all important driver mod.
IMHO, people get too hung up on dyno numbers, go out and run your **** and see what it does. You get your 60 ft down pat, some good tires, gears, suspension and a strong running engine and see the look on the face of the guy who KNOWS he is making more dyno power than you but has a stock suspension/tires and can't drive for crap in your rearview.
I mean hell I absolutely demolished a 300C the other day and we all know the 5.7 Hemis are making at least 350hp at the flywheel. Dude thought he was going to have an easy time vs a lowly 4.6L and I put an immediate 4+ car lengths on him right out of the hole. Not bragging or anything, those cars are pigs even with the decent power but I'm just using it as an example.