Myself, lf-tp2511 and a few others here, have installed Restomod Air units in our Panteras. "Panterror" used a Classic Auto Air unit, which is nearly the same as the Restomod Air. Installation in a late dash car is easier than with an early dash but either way, not a simple installation. Do a search here, for Restomod Air and you'll find lots of info. I used a Don Byars aftermarket condenser that has more capacity than stock but fits in the stock location.
If I were doing it all over, I'd add an extra vent at either end of the dash. This is the way DeTomaso did it beginning with late GT5's. I'm convinced it makes a big difference.