Gerald,
If you want to stick with an original factory system, try finding a parts car with the complete set up. There's a lot you have to change to make it work, but if you get a parts car, it will make installation easier.
I just did this 3years ago to my 80 k/10 pick up. It was a project, but it works great!If you cant find a chevelle parts car, try a 70 -72 MonteCarlo or 73-80 chevy truck.
The compressor, brackets, pulleys& belts are the same.
Good luck!--Jeff