will 3 1/2" offsets fit? Alum slots on 74 Duster?

OMM, your duster looks great, thats the stance and the look im after but with a street radial. is that a 315? 325? i have these old school Kelly Supercharger N50 15s that are like brand new im going to use when i get the Nip/Tuck done lol. these are them on a 15x10...