Two wheel drive automatic, and 3 speed manual transmission trucks got the low center hump.
All SM465 2 wheel drive trucks got the high hump center floor.
All 4x4 trucks standard shift, and automatics have the high center hump floor.
You will need to swap out the pedal assembly, and switch your steering column. Or remove the shifter pin, and remove the shift lever. If you do that you will still have the safety neutral switch operated by the shift collar.
The automatic center hump has a stamped mark where the shifter hole goes.