Ignition system options Options

[Charles Freeborn]

Greetings all,
My car has an Electromotive HPV-1 crank fire ignition that seems to have given up the ghost. The car will run for a few minutes (badly - backfiring out exhaust stumbling) and then die altogether. No spark. When it's stone cold it'll rinse and repeat. It doesn't run long enough to have engine heat be the cause, so I fear it's a component inside that's shorting and causing it to fail. The circuitry is all potted so I can't easily see if there are any fried bits.
I've gone through the install countless times, new crank sensor, ground wires up the wazoo but no love. The company is long gone, so factory service NA.
Does anyone know of a repair or replacement service for these, is it worth it, or should I chuck it all and start over? I honestly don't know if the distributor drive gears are still in the engine. It was all built by Fat Performance in the '90's, but they seem to be gone too.
TIA,
-C

[Charles Freeborn]

Thanks all for ideas. I've tested and grounded everything to excess. Plug wires are new, crank sensor new, coils tested and confirmed good. Voltage to and from sensor correct. As of today I've conclusively concluded that it's the unit itself and most likely on the coil side of the processor. The engine will run (badly- misfiring) for 5 minutes and then die from lack of spark. It's done it twice in a row so my control group is complete. It's not from engine heat as it's not run enough for that so it's something internal shorting that heats up and then fails. I've seen them pop up in classifieds (missed one 2 months ago) but they're getting rare. Not necessarily valuable, just rare. Problem is that any unit I find will be as old as mine.
Current options are to go with the Performance Engineering PE3 (sold by Clewitt) or one of the new 123 distributors and chuck the crank fire. Both have plusses and minuses. Some vintage sanction bodies prefer to see a distributor (even if it's electronic) so that's a plus. The 123 programs with an iPhone, vs the PE3 requires plugging in a laptop. Cost of those 2 systems are competitive.
I will keep an eye on the classifieds, but I fear the listings are drying up.