Jeff - From the GM Heritage Center Info Kits for 1964 Trucks, the engine stamping decodes as:

F = Flint assembly plant

01 = January (month of production)

08 = 8th Day of January

M = 283 V-8 in CK10-30 w/RPO L32

(RPO L32 = 283 Cu. In. V-8 Engine)

~ 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)