Mike,
Also,
1. Check the driver side rear wheel well for the dual exhaust plate:
2. Check the floor boards above the rear axle for special brackets that are welded into the floor/frame rail for the F41 option. (no pic for this one...)
3. Single fuel line is a good sign, should have a rubber hose at the tank end, in between the two lines (under the passenger door area), and one at the fuel pump - like this:
4. Check the core support for this weld nut:
4a. And make sure that the core support has the large opening for the radiator - but now large holes next to the opening on the driver's side (that would be an a/c support, and will/can have the holes on top for the special hood to core seal).
5. Check the speedo cable exit hole on the f/wall, 4speed cars should come out just around the distributor location:
6. Check for this rectangular hole in the trans xmember with a diagonal corner:
