My sons .030 (360) ran several 6.54@3200 pounds with a 727 transmission. Stock crank and flat top pistons. He did have a roller cam in it but we were limited to a .620 because of valve to piston clearance. 8 3/4 with 4:10 gears in it shifted at 6600rpm. Everyone always says build a stroker, build a stroker. Lol