3.5 is fine for a stock car, but id recommend getting some more flow mods on it to account for the extra air youre moving.
do not remove the BBV, you need that. by you saying that the car 'peels out' makes me think you drive it like a 14 year old. why would the gap have changes since you put the plugs in the car? the only way they would is if something broke and hit the plug, which would mean you either broke a valve or a piston or both. if that is the case then good job on running a smaller pulley on a stock car because you just blew up your motor.
time to start taking things apart and finding out what is wrong because im 99% sure you dont have a scanner to even guess at what is wrong.
