67/68 are different than the 69, in that there is no locking mechanism for the ignition, and would have no back drive linkage.

There will be a switch located at the shifter, that will control the NS, and the back up lights. (And I bet if I go to the illustrattions on Steves site that Scott posted it should be there, just haven't looked yet) But it should be a switch that you can test, and or make sure it's even hooked up?

I bet it's a loose wire there or the switch? Always the simple things...

Brett - 67 Drop Top 455!