hello all, I dont have a mustange BUT a 62 ford Fairlane and I have a wheel question, since I can't find any forum for fairlanes so hope you guys can help.

My question is, my stock wheel back spacing is 4" and I bought a set of wheels 15x7 w/ 3 3/4" back spacing. Now I want to run 225/60/15 on them. Will they rub? I called discount tires and they said that last week, they had a 64 ford falcon come in w/ 4" back spacing, The customer's wheels were 15x8 3 3/4" back spacing. They installed 215/65/15 on it with no rubbing. and says that since my wheels are 1" thinner than his, I should be fine on the 225. I know they are the "experts" but I just wanted a 2nd or 3rd opinion on this before I buy some tires.. Thanks!