Mike - According to the GM Heritage Files 1947 Chevrolet Truck Data PDF your "EBM" prefix indicates the engine is a 1947 1/2 ton truck regular production 216 unit built at the Tonawanda Plant. The remaining serial# 260033 indicates your engine was the 259,033 engine off the line from that plant that year (serial#s started at 1001).

An original 216 for your '41 would have "AE" for the prefix. Not to worry as most of our old trucks no longer have their original engines. smile

To find the block casting code and casting date code locations see the 2nd example picture attached below (copied from fellow Stovebolter tclederman's web page. Let us know what those are and we can confirm further details on the engine. wink
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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)