It depends on a number of factors. The original wheels are 15x5 1/2" and generally will accept a 235-70x15 tire without rubbing the drag link. If you have stock steering with these tires it is fine to drive but a bear to park. You can get a wider wheel but probably should not have more than 3 1/2" backspace. If you are planning to install some type of power steering (Toyota, Saganaw, etc) you can use a wider wheel and larger tire.
Fred

Last edited by rfs56trk; 01/25/2008 4:21 AM.

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine