sound like you checked everything, I usually pressure test the engine with the intake still in place, just remove the manifold and riser hose, loop them over to the opposite side of the thermostat housing and pressure the block thru the intake hose.
yes, i have seen intakes crack, if you flip it over and look at the water crossover, you might see a crack, you may have to remove the metal pan on the bottom of the intake to see all the crossover.
With your engine temp being so low, condensation could be your problem, seen it happen before, any idea what the engine oil temp is? Remember, that oil has to get to 212 for it to boil all the moisture out of the oil. Does your engine have an oil cooler? I've seen them leak water into oil before, and if it has been added aftermarket, it may be doing more harm than good by not allowing the oil to get up to operating temp
Check your temp gauge, it should be reading higher than 100 if the thermostat is operating correctly, place your hand on top of the housing after the engine has been run up to temp, you should be able to put your hand on it, but it should feel pretty warm, allmost too hot to keep it there. Harbour freight has those laser temp guns pretty cheap now, buy or borrow one and check teh temp iat the cross over and after the thermostat housing
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