You might be right as I am the 2nd owner and cannot ask the original owner of the truck. Also the hump is held on by bolts so who knows if it was changed.

Thank you for help with this. LMC is trying as well. Here is a picture of the floor without carpet and a few pics of measurements.
Attachments
IMG_7594.JPG (268.61 KB, 123 downloads)
LMC-G2 (4).JPG (278.84 KB, 123 downloads)
LMC-G2 (5).JPG (359.63 KB, 123 downloads)


1960 Chevy Apache (C10)
1965 Chevy C30 Dump Truck
1966 Chevy C30 Tow Truck