Since I repair electronics for a day job I can tell you without reservation that’s there’s two main things that as Cliff has posted about “time” will make them fail.
1) over voltage.
2) heat.
The plug in modules in HEI Dizzy’s should have been heat sinked externally, like mounted on the fire wall to a flat aluminum adapter plate since Pontiac Dizzy’s are in the rear to minimize heat saturation.
If you make up a simple 4 wire extension jumper this can be done to the module in a afternoon.
In terms of semiconductors that make up SS devices ( Transistors and Diodes) every 20 degree drop in temp will double there life, so it’s not a minor change!
Also these internal components a long with resistors and cap’s in these modules will change there ratings and or specs as they go up in temp.
A 10K ohm resistor inside a electronic device might rise up in value to 10.4 K and this can change the functioning of the module in terms of when it throws a spark.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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