On my '68 Road Runner, 295/50R15s on 15x8 4.5 BS fit with plenty of room to spare. Stock springs, ride height, & rearend (Dana - Hemi car).
A couple guys on Moparts with '69 Road Runners have more tire on 15x10s with 5.5 BS and have said no problems.
I think Super Bees & Chargers have more room, but I never checked on my Chargers and never measured or owned a Super Bee.