Help me understand my timing please

67Dart273, i just read in some of MSD's material that they specifically check and set phasing on the pro billet dizzy because it's difficult to change. For what ever that's worth...lol. I think your correct to try a swap and make sure it's a dist. problem.
I hate to bring this up this early in the process, but i'm wondering how old/miles are on it and could cam timing be involved. Also it looks like the concensus is that the magnum heads only require 32-34 total to make the best power.