woah woah woah, this combo is NOT matched at ALL!!! You're shifting a stroker motor at 6700 RPM on stock heads? There's your problem right there buddy, your heads flow for those cubes only to about 5000 RPM, and you're done. THe rest of that spinning you're doing is just wasted ET. Furthermore, your cam is too big for the heads that you have, you have an RPM range that carries way on past what your heads can flow. I'll bet you pick up a second shifting the car at 5500 from now on. If you put a set of 215cc dart pro1 heads on this motor, tuned your chassis to hook up, put a 4160 carb on it and some 373 gears you'd be making friends with the 11 second bracket.

K