I used a poor mans TDC stop. I removed all the plugs and stuck a piece of 1/4" soft copper tubing in the #1 spark plug hole. I turned the engine until it stopped and marked the dampener. Then I rotated the engine the opposite direction until it stopped and placed another mark. TDC was half way in between. I found my engine had a late model dampener on it and the factory mark was about 20* or so off.
Try bypassing the MSD to ensure it's a problem with the box and not somewhere else in the system. I have extra connections in my harness in case my MSD goes bad, it would be really easy to bypass and get home with the traditional setup.
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