I have a 70 cougar and would like to change from 14" tires to 15'. I have 15 x 7 Mag 500 wheels with a 4.25 back space. I would like to use 225 60R 15 on the front and 235 60R 15 on the back. Has any one put this combination on their 70? Will they work without making any adjustment to the car?