I have an electronic copy of the 1955-59 FAM. Below is fairly readable pic of Section 1, Sheet 39 that provides the Dash and Toe Board layout and routing/mounting diagram. Hope this is helpful. wink

EDIT: The lower left diagram applies to your 3100.
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Last edited by Gdads51; 02/11/2024 4:36 PM. Reason: add info
~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
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US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)