This may not be the answer to your quest, but might be?
Had a similar problem with a "Flapper" system that I had installed on my 110 V8,
The engine would run fine for days, then all of a sudden when it got hot it would misfire as if it was out of fuel.
Open the bonnet & let it cool down & off it would go again sometimes for months.
Eventually I tracked it down to the wires from the distributer base plate, they would occasionally move too far under load
& the engine would play up.
Replacing the base plate & Hall effect sensor cured the fault. I sold it 12 months ago & according to the chap I sold it to it was
running around Russia up to a few weeks ago without any further problems!
Tony