67 wheel ?

[bodyman]

i know this has already been asked before but i need a answer pretty quick .... i have a 67 camaro with the original rearend only modification is its been lowered 3" im going with 18" wheels whats the widest size i can run ( 10 ??) & what backspacing ??? i was going to run 18x7 on the front what backspacing ? going with ttII if that matters ? any help would be greatly appreciated. !!!!!!! thanks