This is what i found in the Catalog of V-8 Chevy casting numbers. 3932442 decodes to quite a few vehicles:
1 - '68-81 passenger car, camaro, chevelle or nova with a 350.
2 - '69-85 truck with a 350
3 - '76-85 truck with a 305
4 - '79-82 with a 267
All cranks with that code are cast iron and large journal
I think the rest are date codes when it was made.
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