15x6 Cragars on a '65 Barracuda w/pics

I'm getting ready to buy tires for my 65 Dart. I already have my wheels. I have a set of 4 Cragar SS 15x6 and also a pair of Cragar SS 14x6.

My current plan is to put the 14" wheels on the front with 215/60/14 tires. I will put the 15" wheels on the back with 215/60/15 tires. This will give me some additional rake but will maintain equal sidewall height front to back.

My front tire diameter will be 1/2" smaller than yours. My rear tire diameter will 1/2" larger than yours. The width will be .4" wider than yours front and rear.

Do you think this combination will fit without rubbing? I assume the clearances are the same between a Dart and Barracuda.

If I stepped up to 225/60/15 on the rear would I still be OK on the 15x6 wheels, or would I need the extra backspacing?