I got 57 trim t3/t4's. I'm going to run them at 9-11 PSI at first until I get the fuel system and drivetrain built up a little better. That should be good for 550-600 rwhp. I already have a mcleod twin disk and 26 spline input shaft on the way and hopefully I can keep from snapping any half shafts or blowing my diff cover till I get some more beefed up rear end components.
Once I get that shit all sorted out and get a fuel system that can handle the power I plan to run 21 psi - about 850 rwhp and 900+ rwtq.