Help with block casting numbers

Jose

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Sep 2, 2023
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Car
1966 impala
I need help with block casting numbers I can't figure it out I've tried clr to get the rust and stuff I still can't see the first letter then there 3 then an 8one letter just a 3 and just an 8 my stamp says one thing the cast says different please help
 

63Half-ton461

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Nov 18, 2019
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1978 Monte Carlo 383 slammed
So the casting #s you have are _38_38 , well i checked the database here and online and there isn't anything close.
Maybe the heads could be a good clue ? what casting number heads are on there ?
 

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