*Potentially* Stupid Question

[...] I did have 1 dist pickup to fail years ago...

What are the symptoms of a bad mag pickup in the factory elect ignition ?

I've been operating classic MoPars since 1988 (learned to drive in a friend's '73 Duster 340 / T-Flite !) , and every one of 'em had ballast resistor problems (1969 Swinger 340 [converted], 1972 Swinger [converted] , 1973 Duster , 1976 Duster and presently , my aforementioned '72 Coronet ).
Perhaps I am doing something wrong ... maybe using "hotter" coils has an adverse affect on the lifespan of ballasts ?

What's happening is the car's just doing random "clean shutoffs" ; no stumbling , farting , etc. , just *bLiP* it's off !
Sounds to me like an ignition problem (?)