Drag Radial Tire pressure????

I have a stock 1969 340, 4sp, Swinger with a 3:91 Suregrip. I am starting to race the car in test and tune and wanting to go into Sportsman. Not a fast car but I am doing it for fun. I bought a set of MT drag radials since my redlines just wouldn't work. My question is, what tire pressure should I run? They will only be on the car when at the track. I have heard about 17 pounds but wanted some advice.. Thanks for your reply!