Water dripping through firewall behind the dash
When driving in heavy rain it’s actually dripping through the firewall under the steering column, behind the dash (no doubt past/over electrics) and into footwell near pedals
My experience has been a bit different.
I zerked my pivots because my leak was worse if the wipers were on.
My leak was more or less directly over the fuse box.
The pivot is more over the steering column.
On mine I can see water wick around my windshield gasket and glass and build a small pool of water in the 2 lower corners.
My thinking was if it did not come from the pivots (I don't think it was in hind sight) at least after 56 years my pivots got lubed.
My next thought as to why worse with wipers on... Wiper drags water up to the left edge of the windshield, that water adds to the load on the leaking gasket.
After I discovered the leak (on my way to Bandamere speedway last year) I took all the exterior chrome off (convertible)from around the windshield and cleaned up the goop and old foam. No rust in sight but the gasket was not so playable any more.
I know the windshield was replaced once in the late 79s early 80s and the gasket MAY. have been reused.
I can see where sealer had been applied to various places but not on the outside along the sides or along the bottom to the body.
I have a new seal but put off having it installed (not sure why)
Not sure if this helps