Since the battery has been moved to the trunk, my MSD box is mounted on the side of the front apron where the battery used to be. There are openings in the radiator support in front of the box so that outside air flows over the box.
I'm fairly conviced that the brand new MSD distributor is the culprit also. Its the only thing left in the ignition system. When I wired in the new box I traced all of the wiring and inspected it. I even eliminated a couple of splices with the new harness.
I'm pretty sure that it is not a fuel problem because it doesn't happen all the time. And when it starts cutting out I try to keep it running by patting the gas pedal; when I do that it blows black smoke out of the exhaust pipes as it spits and sputters. This indicates to me that the gas is there but just not being ignited.
We'll get the old distributor back in it tomorrow and then we'll see if that's it. If not, it's back to square one.

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'67 Mustang Coupe
424W-KB Forged 10.2:1-AFR 205's-Victor Jr.-Mighty Demon 825-Comp Cams hyd roller.236/.242 .555/.576-Miller rockers-Hooker Super Comps-Gene Hughes AOD-Broader Performance valve body-3.55 Posi-4 wheel discs