Tire and rim for 69 dart

Do you guys see any problems using a 205/60/15 tire on a magnum 500 series crager and on a 15 x 7" rim or am I better off using a 15 x 6 rim. This will be on a 69 dart. It has 205/70/15 on it now on a 15 x 6 cop rim. The rears are going to be on a 15 x 7 magnum rims with a 245/60/15