sorry, guess I did forget a few thing's of importance,,that is race weight, the converter is a Ultimate 8" at 5200 stall, shifting at 6600 it appears it is going across the stripe at 6800, 4.56 gear's in a dana and 14X32 Phoenix out back, I still haven't optimized my timing, jetting or shift point's yet, also have not touched the suspension from when Holt's set it up for the smallblock, like I said before these heads are ootb un touched except for different valve springs and guide check.