need ideas on a rich running 360

If the engine is popping out the exh. the timing is late. Advance the timing and see if it cleans up, if it doesn't then remove the distributor and take a good look at the pickup to the reluctor. To make sure that the rotor is pointing at the terminal when the reluctor and the pickup are inline, if they aren't inline then remove the reluctor and reinstall the reluctor in the correct position. This is a very common mistake that rebuilders do, along with using bent shafts.