Welcome to Stovebolt. That's a different type of project for your '53, which will best fit into discussions in the
HiPo Shop with all the planned changes.
On a side note, the upper stack of "C channel where the bed goes" is the standard factory setup to support a cargo stake and platform bed. I don't see any hydraulics, so it doesn't appear to have been a dump bed.
I'd love to see more of the '58 GMC 100 when you get a chance to post more pictures. See you in the forums.
