You can get the Freeze 12 kits too, this work ok (I tried it) and does not require evacuation of the AC system. I did lose the compressor about 2 years after the recharge though.
I guess the big difference between the R12 and R134A is the oil.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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