old cragars and a 72 swinger

hey all, bought an old set of cragars at the chrysler classic a couple months ago. they are 15x7 and appear to have both 5x4 and 5x4.5 bolt patterns(unilug i guess). i measured them at 3 1/2 bs. what size tires will i be able to use on my 72 swinger. i will be using the stock spring location with xhd springs and a set of kyb shocks, will also be installing 73+ disc brakes and at some point a narrowed rear(either 8 3/4 or ford 9).eventually. i was thinking of using 225/70-15 on the front and 255/70-15 on the back. can i use a 60 series tire with no mods? let me know what you think of the rims btw, they havent been cleaned but are alluminum.



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