1985 C10 Distributor Problem

I have a 1985 Chevy C10 305 V8 4BBL with a HEI distributor that has no spark. I have checked and replaced the ignition coil, pick-up coil, control module, cap, rotor, and even the RF capacitor and wiring harness but with no avail. The only unit that tested bad was the control module that I had tested at AutoZone. Once I put a new one in the engine fired and ran like a champ even with one spark plug out to perfom the spark test. Once I got everything button up, I took it for a spin around the block. Ran great until I was shouting distance from the house. That's when it cut out and would not fire again. The way it cut off leads me to believe it is an electrical problem. I have retested everything at least three times (even the control module at AutoZone again) and everything checks out good. I have unplugged the Oil pressure light switch just in case it was going bad and causing the problem as a safety. I have 12 volts at the BAT terminal of the distributor when the ignition switch is on but it still will not fire. Are there any other safety switches that I can check? I have read through other posts on the HEI distributors but they did not seem to fit my problem. Any ideas would be greatly appreciated.