70 dart 470 ci drag car build.
Today, we just bumped up the timing 1 degree and it picked up more power 2 HP and 11 on torque. Then for s&g we turned the super sucker tapered spacer upside down and it only lost a 10th of a HP, and 1/2 a foot pound torque at the peaks but a couple numbers throughout the pull.
I think it's getting close to it's best.