casting numbers not listed

Beal

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Aug 20, 2020
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'56 Beal 42foot boat
I have a 1956 boat with twin 350 chevy engines. Trying to determine their year. I found 10066036 in the small block listings and for 3870010 there's no listing. Each says Hecho Mexico. Can anyone tell me what year they are? Thanks
 
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