Only runs 40 Degrees advanced

I will tell you that I have had two hyper spark distributors and one MSD distributor in it and they all do the same thing if they are set up exactly by the book with about 10 or 15° initial they will not fire at all totally dead. their is spark going to the distributor but none coming out and when you quit cranking That makes a spark when you turn the key off then it lights and has tried to run backwards several times if you turn the distributor up to 35 or 40° it starts and sounds real good like it’s all fixed until you try to back the timing back down to normal then it stumbles and dies.
This all started when the distributor got locked up and bent the shaft it hasn’t ran right sense.