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i would check the module also . i used to carry a spare in my tool box. until i picked up a MSD box from a buddy ,hope the MSD box never packs it in .
Had the exact same problem. Ran, then just wouldn't crank. No spark to the plugs. Cleaned up the contacts inside the HEI cap and Replaced the module in HEI...nothing. Replaced the coil inside of the distributor and it fired right up first try. Did it 3 more times and it fired right up every time....knock on wood.