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For me the prime suspects would be heater core or leaking around the windshield . The later is the easiest to check, sit in the passenger side with the door closed and have someone spray one area at a time and check for water, If this yield no results run the A/C for a half hour or so and do the same. Good luck.
 

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This sounds like your evap. drain could be clogged. If it is it will back up and drain out the bottom of the heater box. Just something to check.
 

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The drain is located under the evap case in the engine compartment. You can reach your hand under the case to feel it, or from underneath look past the oil filter housing. On my '69 GTO it looks like a small rubber piece with a spring clamp holding it on the evap. housing. Good luck.
 
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