Dat same ole subject wheels and tires

PROUD OWNER OF A 1972 DART. I AM UPGRADING HER TO DISC BRAKES IN FRONT.I WENT TO THE 4.5 INCH BOLT PATTERN ROTORS.I AM GOING TO PUT 15 x 6 INCH WHEELS ON THE FRONT.WHAT IS THE BEST TIRE I SHOULD USE.(SIZE).I WILL ALSO USE A DANA REAR WITH SAME LOCATION OF STOCK PERCHES.WHAT IS THE LARGEST WHEEL AND TIRE I CAN USE WITHOUT MAJOR MODIFICATIONS TO THE REAR SECTION.GREATLY APPRECIATE THE HELP.