Sbc block vin stamp has no letter in it

Neoogeoo

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Hello everyone I'm a newbie, I recently acquired a 3970010 block stamp pad says V1030C2R below it vin stamp 171133593 (no letter). So c2r under motec.com comes back to an 82 305 probably monte carlo, here's my delima partial vin has no letter after the 17, therefore this can't be an 82 305, I'm stumped can anyone help?
 

63Half-ton461

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1978 Monte Carlo 383 slammed
3970010 block is definitely a 4" bore block used by GM for 302, 327 and 350's definitely not a 305.

What heads are on it, what casting # on the heads ?
 

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