Just installed some 17x8 2003 Mach 1 rims on my 69 coupe. Rims were 5.72 backspace. I used 1" spacers all around. 235/45/17's in front 245/45/17 in rear. Kumho 711 tires. Seems like maybe I could go a little wider in the rear & still be ok. Did not have to roll the fenders with this setup. Instead of going wider with the tires, a slightly wider spacer, maybe 1.2" would work as well. Also my car is lowered 2" all around. The clearance in front is tight where the rim comes close to the upper control arm. A slightly wider spacer up front would also provide additional clearance & still fit ok with the 235/45/17 tires as far as the fender clearance. Anyway, thought this info might be of use to you or whoever. I will be happy to e-mail pictures if anyone is interested.
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