How hard/expensive is it to put modern ac in my 85 gt? The pump compressor is still there...i got an ac pro can to charge my air in the escape..but it didnt need much charging but man does it feel good.....has anyone done this in their older cars? Worth it?

 

EVAC IT, RETRO FIT TO 134A = fittings , if needed add ester oil and recharge 80% of 134a to original r-12 amount