"pretty sure"? is there a patched hole where the 4spd shifter would have come thru? there are no variations in the floor pan other than humped or not
the 3spd and automatic had a slightly raised trans cover that some might call "low hump", the 4spd, because of the lid and shifter on it, needs a hump that's quite pronounced .... the factory didn't pick and choose, if the truck got a 3spd it got the correct floor pan
the metal glass frame was dropped in 64, all the 60-63 should have them, the glass shape changed then too if I remember right
do you have the shop manual and assembly manual? best way to keep it all straight
Bill
