What about the setup itself, even if mint condition factory set-up for R-12, a simple regas with R134a and no adjustments will not find the results or improvements wanted. Along with new hoses, o-rings, drier etc as per regular AC service, also seek an adjustable pressure switch to dial in the preferred settings, and even look at the higher performance parallel flow condenser. I'll keep it vague as early models with POA aren't my thing. Perhaps have a browse through thepartguy.com for ideas.
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