65 dart - stock wheelwells - offset shackles - can I fit an 8.5" rim?

i put 15x7 centerlines on my 65 dart with a dana 60 rear that i cut down to fit. the wheels are 15x7 with 3 3/8 backspacing. i had the rearend out of a truck with 4.10`s. i went through enough 8 3/4 stuff in my roadrunner. the dana looks cool with the chrome cover from the back and the aluminum coilover shocks. Bradley