I did it years ago in my saph cosworth.I pulled it out of a ghia.
Its a dashboard out job,and you have to cut a big hole out of the bulkhead.
Also had to change to a polly-v setup,so i could get the ac pump in,oh and had to make a mounting bracket for the pump.Other than that all went in pretty easily.
Still have a a few kg of r12 in the garage if you need any.