Two 4k quattro questions

[Max Dichter <maxdichter@iname.com>]

The car is an 87 4000 CS Quattro

The first question is how do I tell what kind of AC system is in my car. 
R134? or the old style

The second is how do I tell if I have a 115 horse or a 130 horse engine.  
I was told the five cylinder came in both varieties.

I realize these are both completely novice questions, but hopefully there 
is a person out there who likes to answer questions from novices.

Once again thanks in advance.


Max