BF Goodrich Drag Radial Tire Pressure

Thanks Guys
I'm running 15x8 on the back with offset spring hangers and a shortened 8 3/4
with 4.11 posi. The wheels have a 3 1/2" back space I could even go to a 4" backspace with heaps of room. I'm off to the drags on the weekend so I'll start from 20psi and go down from there. I'll keep you informed..
Tim