Gear ratio decision

I got a 70 duster. Going to be running 560hp small block with a 4 speed manual transmission. Not much freeway mainly cruising and city. 8 3/4 rearend. Mini tub rear to fit some good size meats back there. Not 100% on the size yet. I'm currently setting up the rear end, I'm looking at 4.10 gears. Seems to be a goos choice but i want to be certain My heads swimming trying to figure it out.