Jeff,
I was able go thru some of my pictures and compare them to those you posted.
1. I can clearly see there is no hole on back side of torque box and no holes along frame rail behind torque box.
2. I do see a hole for fastener for fuel line bracket in the floor pan inside of the back end of the drivers frame rail (a few inches in front of the seat access hole).
This seems to be enough evidence that the fuel line ran down the tunnel on #1341, SJ build 2/28/67. None of these areas were replaced as we were fortunate to have very little rust on the bottom side, no floor panels were required.
thanks Jeff your posted pics definately came in handy!