i yself dont know exact details but ive seen 70-81 f body's with 17-18" rubber with no big issues i sure others will know more exact sizes and off sets. but a nine inch wheel will fit with no issues and should work with factory offsets if you know some one ata local tire shop have the mount a 30x9.5 truck tire a ri and test fit heck even a 31x 10.5 as a "rough" idea if itll fit