It would be cool to have A-bodies included but I believe the main emphasis of Nostalgia Super Stock is multi carb big blocks in Factory appearing Hot Rod trim and when considering A-bodies into that factor, like you said Hemi's come to mind which in turn excludes the majority of A-bodies combos of small blocks and Big blocks.
Then again, what I think this Mopar meet needs is an invitational to the new Nostalgic Pro-Stock class guys or the formation of an annex type for this event only to include both Hemi and small block A-bodies that ruled the nest back then.
Maybe a GTS or a Mr. ab-NORM-al class for Big Block wedge A-bodies in the spirit of Mr. Norms A-body creations. I also think there should be a STICK class, but how many STICKS are out there within reach of this region. I don't know, I could be wrong.

I personally love the AF/X class of special altered and 2% Factory Hot Rods of all categories including Pontiac, Ford, Chevrolets.