I was thinking 215/60/15 front and 255/60/15 rear, but not sure on the rear. I will see if the tire shop has a couple used tires that I can try for fitment before I order my new tires with them.
I've run 245/60/15 on factory cop rims. My rear end is as wide as a small bolt pattern because they are small bolt pattern axles and drums, just the bolt pattern was redrilled and tapped for threaded cap screws as lug bolts.
