well,
my not very credible internet source can beat up your not very credible internet source.
http://www.restore-an-old-car.com/positive-ground-cars.htmlEDIT you may be right, though. One reference i found says they switched to negative ground when they went to 12 volts, 1967.
I did help a friend troubleshoot a VW based dune buggy. He'd let the smoke out of two aftermarket stereos by not noticing his was a 12volt positive ground. I am guilty of
assuming it was built that way before the body conversion .
Moral of story: look before you leap.
Have you run across the horn wiring yet ? Steering column gets grounded through the horn switch ?
old jim