I am relatively sure that it is a heat problem, well as sure as I can be considering that I still don't know what the problem really is yet. I feel that there are 3 possibilities as some of you have identified already. The distributor (pickup coil), the coil, or the MSD box. I tried another coil which didn't help and my MSD box is in the trunk away from any heat so that leaves the pickup coil.
I'll let you know what happens when I change the pickup coil. Right now the distributor is in pieces waiting for the new pickup coil.
Wayne