You should be able to clear the 35's right now with some fender moding. On the '91 trail rig I am building, I have a 2" BL, and it currently has 315's BFG MT's that are 34.5" tall when installed on the truck. I have cut the fenders and massaged the cab back to the body mounts. Right now everything clears with normal driving. I plan on running some ball-joint spacers for extra clearance and to increase the articulation a little more. The rear wasn't a problem since I am fabbing up a flatbed for it. You would have to cut the rear some, no problem if you are running cut-out fender flares.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed