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Check the offset because a lot of Pro Comp wheels have a GM-type positive offset that will tuck the tires too close to the body and they will rub on the inside. You want zero offset or very slightly positive, like +10mm or less.
I dont know exactly what your wheel base is but sounds like you have a rear end running either 15 or 14 inch rims with a standard gear ratio,, I have a 1985 base cab that i just took the bed off of last mmonth due too a bandaid here too many issues and bondo begging to make it look like the cat lady from california,,anyways i put some 16 inch 285 rims and tires on the rear end which had 14 225 75s and the bolted right up too the high geared rear end,, unfortunatly I kinda figured i was going too have too use the rear end out of the 2011 xlt that i have for parts any ways ,, the highway 380s is just too much for the 2,3 efi with a 5 speed ,, if your going too use those on the front end be preparede too get a lift kit and do some home work on the front end adjustments , for my truck its going too be a big jump from original 14 to 16s anyways but i was allready headed that way with my rat rod any ways,,
