Distrubutor Problems

1984 GMC 2WD pickup, had a local back yard mechanic replace the engine with a goodwrench 305 since then i am having problems with the distributor...worked fine in the beginning and then it quit running,
replaced the ignition module, 2 weeks later quit again, bought a whole new distributor, 3 weeks later it quit again and i am thinking that it is the module again...
what would be causing this, what should i be looking for?? Could low or high voltage at the distributor power supply wire cause this.
Many Thanks!!!
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Look for bad grounds or a module which isn't grounded well(did you put dieelectric grease under it when installing it?). Pretty famous for that.
Sam

with
high
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it must be a bad ground some where, the new distibutor was completely assembled when boughten, just had to add the coil and cap from other distributor,
anyone have any other thoughts??

new
the
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