I put mine on the front side of the leaf spring hanger on the passenger side. There's a little sort of box where the rear frame rail meets up with some structure that comes from the body (at least on my 67). The stock fuel line runs right near there and it was about the only place lower than the tank I could find that was fairly well protected from stuff. You could always make a little rock shield or something to cover it too. I can try to get some pictures up.