[Ford blue blood]

OK...#7 being low would indicate no fire in the hole....gas washes the cylinder walls, pressure drops because there is no oil in and on the rings. Now I haven't gotten the books out....but....if I remember correctly #7 and #5 are one of those that stays cold with the 302 vs 351 firing order. Do the switch, it will prove out which cam is in the engine and eliminate one potential problem without having to open anything.