Hey guys, I have a 1968 chevy with a 76 small block 400 board 20 over. I am running a Engine Pro CamShaft Valve Lift is Int.488 Exh. 509 with a .050 duration. As of right now I have Edelbrock 750. with an edelbrok intake. I am having problems with keeping my engine running when I put it in Drive. My RPMs are set at 1200 idle, but when I put it into drive it drops down past 300rms if not lower, and bogs down and dies. Should I drop my carb size any? Or does anyone have any other suggestions to try?