1972 suburban a/c front and rear

[orange72sub]

I recently bought mr sub I love it! The a/c compressor is missing nut the factory rear a/c and the rest of the front a/c components are still there. My question is weather I should try to rebuild what's left or should I start over? What to I need to do to check the system out? Is there a better system to fit in it's place. Any help would be great for these are un charted waters for me.
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