Wrenchman, Just in case it may help in confirming the ID of your truck, check out this article I came across this morning Gary's 1927 GMC Firetruck. There are some pictures in there that seem to confirm your radiator surround and wheels look to match with his truck. It also talks to a Buick I-6 power plant which may be what your truck has???

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)