I think this is the wrong number. The last 2 digits should be the engine casting year. Look just above the number you took a pic off; and yes, it is behind the fire protector for air intake 
see below for an example
https://www.moyermarineforum.com/for...3&postcount=20
several more pictures in the dedicated poll
https://www.moyermarineforum.com/for...?t=5533&page=3
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Surcouf
A nostalgic PO - Previously "Almost There" - Catalina 27 (1979)
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