1938 GMC Engine and 4 Speed Trans
 

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Not my Stuff and no connection to me.
Ben in Toronto

Updraft carburetor and shift lever suggest a COE application. This is consistent with the frame brackets.
221/239/257/286 seem to have been an earlier family of GMC engines (approx. mid 30s?), before the 228/248 and 256/270/302 families
Some other parts in the photos look similar in design to their CMP counterparts.