Stop worrying about whether the tYres will fit. Can't you get a baseball bat over there? You put the wheels on and then if they rub you roll the bat between the fender/lip and the wheel (many times). Make sure you've got a nice wooden bat too.
I agree with getting the original look repro's in the 15" just figure what width you need in front and back. 245/60 15's should go in without too much concern with hitting the shocks/springs in the back. Fronts will be more of the 225 variety at a maximum.
First things first tho you'll need a nice roll bar set. If the front looks meaty enough then just add the rear and it'll handle "tighter than a ... (you figure that out)"
