I had a similiar problem in my 67... When I applied the brakes, both rear left turn signal/brake bulbs would short out, but only when I had the left turn signal on....
I replaced the sockets, checked the ground and traced it to the wiring harness underneath the carpet... I was lucky and found one on Ebay for 12 bucks...
I would also try replacing the brake-light switch on the pedal.... It's relatively cheap and easy to do, I have had those go bad on me as well.....
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