Wilwood conversion problem

So I just ended up biting the bullet. Installed everything up, went with the 5 x 4.5 bolt pattern, and now I'm in the market for some 15" wheels. Any ideas what I need in terms of back spacing and offset, and how wide and tall can I get away with? I'm thinking 15 x 6's with 195-60 tires on the front and 205 or 215-70's on the rear (I want a forward leaning stance). Do I have enough room for these?