Mine is a 410 CI Small block and I hit it with a 200 Shot of Juice. I would say I am running right at 725hp + through the trans right now. I build the transmission which is an A904 myself with the help of 70aarcuda and Crackedback's Recipe. I am just about done upgrading to Ladder Bar and Ford 9" with 4.30 gears. I should be back on the ground in the next couple weeks and out for test and tune.