if you look at my pictures, i had a guy ask me the exact same question about a year ago, so i took a bunch of pictures showing exactly how a set of 35"s fit on a 4x4 first gen with know modifications to the suspension. i had to trim the front fenders a bit, but they were ok. the biggest problem youll have is them rubbing the the bottom of the cab, when you turn sharp on, mainly going into or out of steep parking lots. i lifted my rear 2"s, and my front about 3"-3 1/2"s and i cant get em to rub if i wanted to.
Chris, that white '90 you got is beautiful!!! ive always wondered whose that was. is it 5spd?? if so, do you think youll ever be interested in selling it?