Got her all back together & road tested. She's running on all 8, sounds good, and pulls nice. (Other than a wild new rear end shake @ about 60mph...
).
I don't know if it's problem solved or just problem post-poned. Let's hope for the former. Nothing to do now but drive her & see if she repeats.
Thanks Tom & Peter! Who knows how long it would have taken me to track down the cams in the bottom of the distributor w/o the heads-up. Too much time w/ mechanical injection, I guess.