No traction

Hello folks..I need some advice. I scored(or so I thought) a pair of vintage G60-15 Biased Ply tires. They were never mounted and still had that waxy blue stuff on them. They were stored inside and you could tell they were still soft. Not rot whatsoever. And they balanced out real nice.They are probably 25 years old. I paid $100 for both. I figured I'd go with the retro look while getting some much needed grip. Well..I can't even go half throttle at a rolling start without these things just spinning wildly. Do they need to be broken in? Lower tire pressure? Do they need to be heated up? Or am I looking at purchasing a set of those 1/2 street 1/2 strip tires. The engine is a 391hp 340 dyno'd at the flywheel;3:91 sure grip and a 904 with the TransGo Stage II kit/Hughes 2500 torque converter. I want to go the Mopars at the Strip and blast down the 1/4 mile and don't want to sit at the starting line spinning away. What do you guys think? Here is a picture of the tires on my car.