If it's a cruiser/driver, go 3.23. A 440 makes plenty of torque to turns the tires still. If your barely on the highway 3.55s would be ok too with the 28" tires.

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram