If you're going street rod type coil over on the front, which most MII's are, you'll have about 3" total travel or 1 1/2" each way. I like to have the 1 !/2"+1/2" clearance from fender to tire when the steering is at full lock in either direction. The front tire moves up and down on an arc, but this arc is measured in degrees of camber, usually no more then 7 degrees camber gain. This is all best measured when the suspension is installed at mock up, then time to decide on the tire and wheel size and width. The rear doesn't need as much clearance, 1" is more then enough.