I attempted to buy a set of 8 plugs for the ford, but the parts store only had 6. So I bought what they had and gapped and installed the 6 plugs. The plugs are NGK TR5 2238 V-Power. Since I didnt have 8 plugs, the two that didnt get replaced were removed, cleaned up, gapped and re-installed.
I checked the gap on the plugs and they were .044. So I adjusted that gap to .040, to see if that will reduce the load on the ignition system and slow/stop the carbonization on the MSD distributor cap terminals.