Good job with your initial investigating. smile Your engine is a 1954 235 "regular" engine, but originally a passenger car unit per the data screenshot below taken from the 1954 Chevrolet Truck data file from the GM Heritage Center.

An original pickup "truck" engine would have ended in a "X" for the 3100 model. Not a problem as the vast majority of our trucks probably are supporting transplanted engines. As a "Z" unit, it originally came with a solid cam and lifters VS the automatic equipped engines which sported hydraulic camshafts and lifters.

BTW - Just a note that it's best to ask specific questions like your engine ID in the appropriate Shop Area Forum as the Welcome Center is more about introducing you and your truck to the community.
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~ 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)