Rarest A-Body Option?

I think some options are based on location. Our Hawaiian members have a lot of cars with heater delete, I`d guess they would also have A/C. Cars headed to the northern market likely had fewer cars equipped with A/C. Cars for the southern market could have a (white painted top) for help with heat dissipation.

Yeah that sounds about right. Also dealerships spent a lot of time installing power windows and a/c in cars after they were purchased. That is why the switches look so much like GM or Ford and have a crank delete plugs on the door panels. This was going on until the 80's. Also you could spec a car as you like and not based on a "package" too.

I remember my brother ordered a 68 Ford Torino GT with a 4sp, manual steering and power disc brakes in black an without a/c. He walked to work for 8 weeks waiting for its arrival. All his friends didn't understand the need for disc brakes he recalls.