I just purchased a set of Weld racing wheels and tires. They are 15x8. The tire sizes are 215/60/15 for the front and 275/60/15 for the rear. They have 4.5" backspacing. The rearend is an 8 1/4 with all stock suspension. Do you think these rims and tires will fit on my 73 duster? If not, I may...