The key to having good A/C in a Firebird is to make sure all your under dash duct work fits properly and is thoroughly sealed. Having these cars for 40 years and have battled exactly what you are talking about i figured out years ago that the factory ductwork was never an ideal design. My Firebirds have excellent A/C after the careful and painstaking task of having all the ducts installed and sealed properly.
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1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars
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