Husker,
The 207 in ECM207722 means your engine is a 207.
Supposedly '37 was the first year for the 216 but based on your low s/n of 722 looks as if you got a left over 207 or someone installed it later. My guess is the first one.
'31 Chevy 1 1/2 ton,
'42 GMC 2 1/2 ton 6x4,
'52 GMC 2 1/2 ton 6x6,
'53 GMC 5 ton
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