I think that having the factory A/C will be a benefit to the sale, particularly if it works. Did you do the ones in Duane Hyatts cars?
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I'll just leave this here. Non-invasive, no body mods, half the weight and uses less than 1 HP.
http://www.classicretrofit.com/elect...11-1974--1989/
Dealer installed? I say pull it, fix the gaping wounds.