Working on a '73 340 'cuda that has a Proform distributor. I'm trying to set the timing and cannot get it to run with less than about 30 degrees advance, which also comes in at a very low RPM. Is this typical of them? I'm about to toss in a factory electronic distributor and see. Are these things phased funny or???

I did double check that TDC on the balancer was TDC on the piston. Interestingly enough I ran into a similar problem with a different Chinese distributor in a 273 that has similar timing issues. I was about to blame my nearly 20 yo Craftsman dial timing light except that it timed correct on my 440, but I still borrowed my sons timing light to confirm.