Hello folks. Im building a 72 Camaro, or is built a little. I did a 350 to 383, set of 68-72 76cc heads with 1.94/1.50 stainless valves, 1.5 roller rockers, .550lift springs, howards rattler cam .480/.289-1800-5600 hyd flat tap, long tube headers, cheap 500cfm holley. Question is, what is killing it so bad. has 2500 stall, 350 trans, 4.10 gear. 0-300ft is all itll pull. itll turn 5k with a blink of a eye. Oh, did the eagle stroker kit from summit, any suggestions?