...Try this, it is simple. Disconnect & plug the VA. Adjust timing [ turn dist ] for ~25* of timing [ so engine will have 25* initial timing ]. Re-adjust idle mixture screws. Test drive; you may get pinging for this test, that is ok.
I did a test drive with it set-up that way a few days ago. It was fine cruising. Today I am going to check fuel pressure as I am wondering if it is too high. (Carter mechanical pump)