This is a job that can be done by a do-it-yourselfer, but it will take some time, especially if you are using the original compressor bracket since most of the components on the front of the engine will need to be removed to mount it and the condensor. There is an easier way if you go to a rotary compressor and leave the alternator in its traditional position. Joe A and I have exchnaged a number of posts on this. Joe used a bracket from a period sedan to mount the rotary compressor up above the intake manifold. Others have used a flat plate mount across the front of the engine. You have an option of staying with R12 refrigerant of converting over to R134A. While the R12 is more efficent, the R134A is readily available in small cans at most auto parts stores. R12 can be very difficult to source and is expensive. The R134A setup will require different hosing from the R12 due to the higher pressures it operates under and the smaller size of the gas molecules. When I did my setup, I custom cut all the hosing and crimped them in place to ensure they are all the proper length. In order to do this, I purchased a hand hose crimper. One of the last things you want to do is to cut all your hoses, take them someplace to have the fittings crimped on only to find they are too short! Hope this helps.
George