Who Can Diagnose THIS Total Mystery? Win A Prize?

[supergnat]

I have been having similar problems and think I may have located the offending part. I won't know for sure until it arrives and I install it. The mystery part may be the POINT BLOCK. I discovered that mine is not holding the fixed point securely. It may be that when the distributor heats-up the threaded hole for the fixed point expands causing intermittent contact. I will report back probably Thursday.

Good luck
Supergnat