It is a '68 intake, '68 1-barrel carburetor mounting adapter. The 2F carb with throttle linkage doesn't fit with the '68 air cleaner, or at least with my '70-intake. The 2F intake manifold places the carburetor more away from the valve cover. The 2F carb needs a 2F air cleaner assembly.
Ideally, the head bolts for the air cleaner mount are not removed. The head bolt removal process is sequential. So, you have to remove them in order, and the routine is to not relieve all the torque at once, according to the manual, which forces you to redo every head bolt. If nothing else, running a tap thru the block before you re-torque a head bolt is imperative, if you observe the head bolt torque recommendations. So, figure out if you can get the carb matched to your air cleaner, and F-engine valve cover.
Mine is a '75, and aside from the FJ62 transfer shifter knob, pintle hitch and the 'Land Cruiser' stamped bezel, I basically want it to look like the truck that was purchased somewhere in the USA, correct to the year, although I've missed my goal.