Mystery compressor

The engine in my car is a 318. The drive pulley on the compressor is a dual groove, and it's five inches in diameter. My car was equipped with A/C, but all the under-hood stuff is gone. When I put my car back together, I would like to have A/C, and if I can use this compressor, that would be one less thing I would have to buy. Rebuilding the compressor is pretty straight forward as well, and is something I would do anyway.