If you are going the new distributor route, I had a very good result with my distributor upgrade (351W). you can see it in the photo, below.

Here it is: 27. Protec Retro Distributor (RK107025A) . Skidim. Some ask me, "what's the best upgrade you did?" This one is top three, to be sure. I can turn the key, even when hot, and idle at 400 RPM. I picked up at least four MPH.