I have never known what cam I have. Previous owner didn't have any documentation on the engine build, so when I sent the heads off to the machine shop, I measured lift. It was something like .447 on both intake and exhaust -- it's written down somewhere -- so they did their best to match the springs to that. I'll try to dig up the spring p/n, but the pressures they gave me were 120 seat and 285 open. I know that probably doesn't help without knowing the spring part numbers.
I know you've mentioned reversed polarity before, and I've tried to pay attention to the light while checking timing. The light seems pretty consistent until it gets to the higher RPM, and then it will skip around a little in position, maybe miss a strobe here or there.