Need a Mopar guru: 273 part-throttle ping driving me crazy!

66fs said
Cast iron, dual point, ball bearing vacuum advance Prestolite distributors only came on Commando / Charger 4 barrel 273's

I have to check but I don't remember if this Prestolite 3438225 dizzy is a dual-point...?

66fs said
a standard Chrysler distributor

What is(are) the model number(s) for a "standard Chrysler distributor" I can look for so I can test to determine if the mechanical advance is happening too soon/too much?