Best size tires for your 1973 duster with 15x7 front 15x8 rear crag-er SST you have a new set of 23560r15 on the rear and they do not look the best any suggestions?

205 70 15 front = 26.3 diameter

255 60 15 rear = 27.1 diameter

front offset needs to be at least 4 inch

rear offset needs to be 4 1/4 to 4 1/2

( better if front rim 15x6)