I used a petronix ignitor II in a 318 poly. It works great, never had a problem.

My 273 has a mopar setup...I'm going to be putting the old distributor with a Petronix conversion in her these next coming weeks when I'm doing all the other work I need.

I don't know if it was just mine, but the distributor was crap. Every cap I put on there I've had problems. None of the caps seem to stay in place where they're supposed to. I've even tried using different clips thinking that maybe the clips were just weak. Nope.