Engine grounded/ control box grounded ? First step would be check and be sure wires are in correct order, second check coil output. The dist here is very suspect I would pull it and replace it with known good dist. If that does not work get a advance timing light and see what timing you have when it pop's I try getting mine to 38-40 degree's total If it talks turn it back if not give it more you could have damper that is going off by ring slip{ not Likely but possible if original}Also a vacuum leak will do the same Thing valve springs can do it also{ not likely}