Im doin the same resurch, only wantin to clear 33s.. Are you runnin a body lift? you can do some taller spring perchs that can gain an inch. Im currently about to use (1983 3/4 toy 2wd rears mixed with some 1988 4x4 rears. FRONT) and for rears I will just use 90s chevy 2wd 63s with 2"blocks