It was in the tune... After that we smoothed it out, made peak 504.4rwhp (This is with 35 spline axles, 4.10 gears, spool, 9") I'd contribute to heatsoak the loss of little power.

Then we swapped to a TH350, 5500 stall, unlocked verter so no more 6-spd numbers. Car made 448rwhp.