wheel & tyre sizes

[evilzee28]

Hi Guys, i've just got a '69 SS Camaro into the 'shop for some bodywork & a paintjob. The cars been lowered about 2-3 inches & the owner wants to put bigger wheels & tyres onto it but doesn't want to mini-tub it. What are the largest 17" wheels & tyres you can fit front & rear? Also what would be the largest 18" wheel & tyre combo for the same car? What backspacing would be used to get these wheels/tyres under the arches without modifying the metalwork? he doesn't mind if the arches need to be "rolled" slightly on the underside lip. Thanks.......Nigel