I think very much we have very similar builds you and I MOPARJ.
Indeed a higher stall, not much, would be good. That tranny I have is a lock up '79 model. 3.91 would get this pup moven well. My finish line RPM was never exactly noted, but IIRC, somewhere around 5000, give or take.
Not to mention a bit more compresion. That '79, 318 of mine is dead on it's heels with probably less than 8.0-1 though advertised at 8-1 when new.
I ran @ ATCO on the MoPar meet day a 15.14 @ 89 without a tuned distrib or carb. When I tune those up/dail those in better on a slightly warmer day, it'll run the 14's.