I run 245/60/15's on my dads 68 charger on 15x7's with no clearance issues at all. I can snap a few pics if you would like. They fill up the wheelwell nicely.
-Jon
70 challenger convertible. 340/5 speed. blown, intercooled, efi, blah blah blah
71 valiant scamp 318/A833OD/AC/PS
00 dakota RC 4.7L 5 spd autoX'r. SRT10/T56 swap in process
73 W200 Power wagon, PTO winch, 4 spd