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You'll need to track the leak backwards to see where it comes from. For one thing, I doubt that seam sealer from that era was meant to last 40+ years. May be coming from the sides of the cowl or bottom corners of the windshield opening. Look at the heater's floor outlets, are they dry? Also look where the heater unit attaches to the cowl chamber.
It's not uncommon for water to enter at the hinge pillars, sometimes at the vent frame seal; there should be some "dum-dum" under the end. In those cases the water usually collects right below on the floor, though.



Ok I will do that