Re: 57 GMC, frame swap, 4wd, 454 big block, 4 speed
how about a picture of the connection? sounds like the one wire reservoir connector on some GM master cylinders.
https://www.ihpartsamerica.com/store/MBM-PVP.html
edit: looks really similar
https://www.ebay.com/itm/GM-Gas-Tank...-/372214535698
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