Thanks for all the input. I will check the timing chain for stretch. It has a Hi-Rev 7500 electronic ignition on it, so I'm hoping that timing curve is decent. The initial timing is set to 12 BTDC and when I have tried to advance it further, the crappy California gas can't keep it from pinging.

After reading some of your stories, it appears I am expecting too much from a stock 383. It's a survivor, so I'm not going to hop it up. It's mostly a cruiser for me.