In your post I'm assuming that the over heating issue on the
1936 120 was the one initiated my me. I just updated it with a cause - a failed thermostat.
On your leak - 1) if the leak is along a seam 2) the tank is clean, and 3) the area on seam where the leak is occurring I would try the two part epoxy like JB Weld again. You MUST make sure the metal is super clean. Get the fuel level low enough that there is no liquid at that level. Use a fine wire wire brush that can get down to the very bottom where the sections are clean. Push the epoxy down into the seam to ensure it get into the cracks.
I was successful in sealing a leak on my '51 where the fill spout was joined the tank. BTW I used PC-7 , which I already had from rebuilding the steering wheel on my '32.
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