Im currently working with a stock 302 besides the basic bolt-ons (CAI, Pulleys, Headers etc.)....I came across a brand new Edelbrock RPM Performer Cam from a friend who I traded with for 24lb injectors..but anyways the cam specs are .496/.520 lift with 290/300 Duration pushing against flat tappet hydraulic lifters....My question is how would a cam this size perform with gt40 heads. I also have matching edelbrock sure seat valve springs retainers,seals, and locks that will be replacing the stock valve springs on the gt40 if its worth the swap from the stock e7 heads. Help Me Out!!