I have a 406 sb in my 66 chevelle. It has 373 gears and posi. The engine has fully worked heads and a 292 cam with 512 lift intake and exhaust and 244 @ 50 duration. The car is slighty surging when cruising around. It is almost enought to make me hit the gas due to the surge. If you floor it, it will take off and run like hell. I'm suspecting in the 1st and 2nd gear I'm loping on the cam and that is what is causing this. If anyone knows or has had this problem let me hear your solutions.
kevin
kevin