Classic auto air install:will 72 duster heater controls fit 73 dash ????????

Classic auto air install:will 72 duster heater controls fit 73 dash ????????

I HAVE A 68 DART GT IT HAS NO HEATER OR A/C. I WOULD LIKE TO PUT A/C IN THE CAR SO I CAN DRIVE IT IN THE SUMMER MONTHS DOWN HERE (FL). ANY IDEAS ON HOW AND WHERE TO GET WHAT I NEED TO MAKE THIS HAPPEN? WOULD IT BE A DIFFICULT INSTALL? I KNOW MY BROTHERS HERE WON'T LET ME DOWN. THANKS