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According to that order sheet, you could. Resulting warranty data may have been why '69-70 cars with LT-1 engines could not order A/C. I'll bet the dealerships changed a lot of A/C belts on the 350hp engines. (Not sure how many of those would have ordered A/C.)
You're probably right. That was the reason for not having AC on the 435. Flying belts. More work for dealerships.