widest and tallest tires on a 68 barracuda

i know this has probobly been asked a million times but this may be different.weve got a 68 cuda which we plan on doing the us body spring relocation kit on.weve got an 8 3/4 thats been narrowed 3 inches per side with no spring mounts on it yet.my son loves the old school look with skinnys on the front and fatties on the rear.we have decided to go with direct bolt pattern cragar ss wheels.were ordering the fronts soon and were getting 4.5 wide with 26 in tires 6 in wide.both the front and rear are now 4.5 bolt pattern.i have a set of mickey thompson 33 x 18 tires on steel wheels that have 2 patterns on them.one of which will fit 4.5.i know these are huge but is there any way these will fit even if they stuck out a bit with just the spring relocation?if not what is the largest and widest you guys have ever seen that are still using leafsprings?
the 33s were onmy narrowed dana 60 in my 91 s10 and they didnt even come close to going beyond the bedsides but the springs were brought in 6 in per side.
thanks