66 A/C - How do I check for leaks before charging

Is there anyway to check for leaks in the condenser and evaporator before installing the compressor and charging the AC. When I got the car, the AC did not work. I charged it and it worked about 2 days. I ended up storing the car for a few years and am now getting back to working on it.

Right now I have the engine out and the compressor is removed. So what I have is 2 hoses coming from the evaporator and 2 coming from the condenser. Is there any way with air and/or vacuum that I can test for leaks in the condenser or evaporator before I put the engine back in. If there is a leak in the condenser, it is way easier to get at right now. Does anyone know the pressure and/or vacuum required for the evaporator and condenser that would be needed to see if there is a leak. I know that this will be different for both.
 
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