I've heard more horror stories about ACCEL and MSD ignition systems. My old 93 Z28 had a Jacobs MilageMaster ignition box in it when I got the car. I put 46K miles on it with a supercharger and never any problems. I put a GMPP distributor and Hypertech coil in my 91 SS454 pickup and it ran awesome with incredibly clean emissions. A guy in our club had 4 optispark distributors cooked in his Camaro until he got rid of his MSD. Go back to the stock ignition to make sure there is nothing wrong with it. The overheating doesn't make sense unless your fan turned off on you. Sounds like the engine is fine, but your ignition is messed up.