I'm thinking of possibly trading my 65 Dodge dart GT blown 440 for a A body or b-body four-speed.

Nice. I've been thinking about some 355s to drive my Roadrunner more. 410s in it for the last 20 years. 4.56s before that. 28 inch tires. Had some 30s but didn't do the rpms I wanted at the track. Probably needs 430s!