Biggest Rear tire setup on stock 68 dart 14" wheel

about a year ago i had the exact same question ! on my 69 swinger i switched it to large bolt and my wheel of choice off a 1980 cordoba 15/7 with 4.5"of backspace ss springs that i added a leaf to ! im running bfg ta's 235/70/15 and they are tight !! the clearance issues are, inner fender to sidewall, (1/2"more backspace would cure this problem) tread to front wheel house is tight ! so i think i will drop to a 60 series next time ! the way it is your ok if u dont put anything in the trunk or backseat!! here is my thread with pics have a look !!! http://www.forabodiesonly.com/mopar/vbpicgallery.php?do=hall&u+30355 or check member gallery ....rda340 hope this helps !!