I would check the coil connections and try a different module inside the distributor. I had this problem before, P.O. converted to HEI but left the original power wire to the distributor there and kept burning out modules, changed the wire with one from a '76 truck and haven't had a problem since.
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'51 South Bend Model "9A"
'56 Chevy 3600 NAPCO
'74 Chevy Cheyenne Super K20-restored on 37's
'72 GMC Sierra Custom K2500- in progress
'08 GMC Envoy Denali
'12 GMC Sierra 2500HD Denali
'17 GMC Yukon XL
VCCA member #58596
http://www.nohrco.com
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