Only runs 40 Degrees advanced

You have to remember that this all started after the distributor got jammed so I don’t think it would affect the electronics it Has to be something mechanical but when I checked everything appears to still be lined up top dead center on the timing cover and balancer Still agree piston looks to be at top dead center also. When I took the timing cover off the cam is still dot to dot like I put it in five years ago. I tried two different hyper spark distributors hooked up with timing control same issue I unhooked timing control and set up a MSD pro billet with weights to let it control timing but still have the same issue. So something gave when the distributor got locked up and I hit the starter and it cranked over making the Clunk Clock noise but never fired somehow that caused all this because it has not run right sense. Now when I do get it running at 35 or 40° it sounds good but if you drop it in gear it will die immediately. It will rev up and sounds OK but again that’s with no load And the distributor bumped the timing up to 50 or 60° But the motor doesn’t care because it’s just been reved up and coming back down with no load. I had the intake off looked at the lobes looked at the cam gear it looked fine. I had the head off looked at number one piston on top dead center looked right at the top of the deck couldn’t be no more than a few thousands off if it is. I change the intermediate shaft just because the slot look messed up some. the gear was just fine. The other end of the Cam the timing set all look just fine Could there be a Soft spot in the Cam maybe but it seems like it would have failed before now.