1/4 mile times

I would checked your timing to make sure its not to far advanced. An Aluminum head big block motors runs better with only around 34 degrees instead of 38. We tried this on the dyno and my torque and Hp were higher. I would try this and see what happens on the track. Nows the time to do only one change at a time and see if it helps.
i would also check to make sure you getting wide open throttle and that your fuel pressure is around 6 PSI.