Post your wheel and tire combos.

I have a question. After reading through all the posts, it seems like a wider rim can be used on an unaltered fender well / leaf-spring car when a 18" rim is used, instead of a 17". Am I reading the posts incorrectly?

I'm thinking about going w/ Cragar 397 series wheels in 17"X8" with 4 1/2" back spacing. After reading through the posts, I'm even more lost if they'll fit on my 73 Swinger. My car sits pretty low since adding Hotchkis leafs. I'm thinking 225/50-17 in the front and 245/50-17 in the rear. Any thoughts about fitment issues I might have?

Thanks!