I am installing a set of x303 heads, a E-cam, performer intake this weekend and was wondering will I need to go to 24lb injectors to get the full benefit of the H/C/I upgrade? Also would I need to upgrade to a 70mm throttle body?
Is your heart set on that E cam. Those motorsport cams are only good for making noise, they really don't let the heads breath the way they should. You can get away with running stock injectors. If you can't get injectors by the weekend, don't let that hold you back. They are easy to change later on. It would probably run better with 24s though.