Carb selection help, please ?

NIce, long time owner.

The wheel size would be 225/70/14? Rim size alone means nuts. He he he.

I'd still wonder about the cam. Ummm, heads are stock minus springs?

MoPar used to recomend there 292/.509 cam with non-ported heads IIRC. That cam could be large(ish?)
I'd still stay with the 670 Holley. Plenty of cfm for ethier. The larger carb can make it muddy down low even with the 3.91's.