3 Point Belts??
I put an anchor behind the rear seat back above the rear wheel well
This thread:
http://www.forabodiesonly.com/mopar/showthread.php?t=184851
The photo is out of a 67 options pamphlet from the Hamtramck registry
http://www.hamtramck-historical.com/
I'm running some aftermarket seats in my car and did them like this:
I will admit I "cheated." I ran the lap buckle over as far to the right as I could get, and am using a single shoulder belt diagonally similar to the factory set up. I'm sure NHRA would not approve, but then I'm not planning on showing up, either.