Mystery compressor

The engine block is a 1970 casting. A lot of the original 273 parts were on the engine when I bought the car. Hi-Po valve covers, 4bbl intake and carb, air cleaner, crank pulley. I plan on using the cast iron water pump and older style timing cover and balancer so the engine looks like a 273. Trying to use this compressor may be more hassle than it's worth. I suppose I should contact CAA and find out how much all this stuff will cost to piece meal together vs. a retro fit kit. Thanks for the responses and photos. Always a lot of good advise on this forum. Thanks FABO friends.