Thank you for posting that. I guess as the old cliche goes, your mileage will vary. None of my car chums who sported that style GM HEI never had problems nor I with a similar distributor that's been on my early 70's Caprice Classic for 20+ years now and still working just fine.
The wires in mine are a silicone high strand count and very flexible, similar to lab grade test leads. I wonder if certain OEM years or indeed certain aftermarket suppliers cut corners with the wiring at some point.
But I can definitely imagine intermittent problems if you're seeing breaks in the wiring.
Yes, that is the key thing, good quality flexible wires.
The early oem modules had very coarse and stiff wires, and as you can imagine,
they are very troublesome.
GM did upgrade the modules with better quality wires later in production,
the aftermarket modules have decent wire as well,
tho these days with cheap MIC parts.. who knows what you will get.
As mentioned, I have seen this issue many times over the years, tho not lately...
Probably my first encounter was approx 1979 or so.
Customer vehicle we did auto trans overhaul, TH-350, (I am trans rebuilder going on 40+ years)
Got trans installed and didn't work right.
Problem was vacuum issue. Lotsa vacuum leaks. (auto trans requires good vacuum to modulator)
Got vacuum leaks fixed and now dist vacuum advance started working... annnnd...
Now engine won't run properly.
Dies when you tip in throttle and vac advance moves. Start and idle ok.
Before, with vacuum leaks, dist vac advance was not working.
We fix leaks... vac advance (and tranny) works but engine dies.
Go figure... ALL things are related, when trouble shooting engine (or any) problem,
all aspects of complete system must be considered.