[sigshooter]

The High hump was for the 4 speed manual stick shift tranny, it was needed to clear the height of the trans and was able to be unbolted for trans removal.

The low hump was for 3 speed maual and automatic trans, this gave you much more floor space and leg room.

I have found several 1963's that had a bolt in low hump, this makes a great donor for the changeover because even though you still have to change the small piece in front of the hump attached to the firewall, it bolts in where the high hump came out.... a lot less welding

Here is one I did today , simply unbolt the high hump and remove. then drill out all the spot welds on the lower firewall piece and remove.

Then test fit your donor pieces, clean up the spot weld area and spot weld it back in. Bolt in the low hump and your done