225/75R15's make a nice front tire for 6" wheels, too. Really, though, just get used to making sure you're moving while turning and it is a non-issue, IMHO.
Probably a good time to check/top off the gear box lube and grease all the suspension/steering grease fittings while you have the wheels off, too. (Not that that's making it hard to steer, just probably hasn't been done in several decades.)
Some of my crap:
1963 C-30 flatbed dually 292/SM420
1965 C-10 LWB fleet 250/column shift 3 speed
1965 C-30 9' stepside 250/SM420/4.10 gears (my DD)
Website I made for my crap:
http://www.66submarine.com