Too much cam?

Check some websites. You can degree a cam with a degree wheel and a piston stop. If the thing still runs at 25 degrees advanced there is definately a valve and/or distributor timing problem. Mopar distributors either go in one way or the other but you can put the drive gear in many different positions.
You should be able to stick your finger in #1 spark plug hole and bump the engine over to find top dead center. When it blows your finger out you should be close to top dead center.The timing mark on the balancer should be very close to zero. Then pop the distributor cap and the rotor should be pointing at #1 position on the cap. If it's not, reposition the plug wires correctly. The engine should start and run and be close to 0 timing advance. Then you can set it with your timing light to 10 or 12 deg. advanced. It should run good there. toolman