I actually understand epoxy, as I used to work at Honeywell and filled prox switches with epoxy. We baked them in a oven at 150 degrees to get the bubbles out, then finish filling the switch.
Anyways, I've never run an epoxy coil on a older mopar before and was wondering if there was a benefit. Seems by your post, epoxy coils are meant for HEI ?? I don't have HEI, so perhaps I should stick with the oil filled coils? I was only thinking epoxy coil for heat reduction and long life.