A Vintage Air unit will cool better than a factory unit converted to run with R 134a. I converted the AC on my 91 Buick Estate Wagon to R 134a and it worked pretty decent. I just bought parts from the local parts dealer and put it together at school. With an older car you would probably have to get factory parts from places like Kanter and Fusick. Vintage Air might be the way to go, especially if they make a specific kit for your car (since Cutlasses are so common). 
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"Some men are Baptists, others Catholics. My father was an OLDSMOBILE man." Ralphie Billingsley A Christmas Story 1983
"We rei-eign, supreme, ooooh god! Burrito supreme, and a chicken supreme, and a CUTLASS SUPREME!" Tenacious D 2007
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