Big Block ID

Good afternoon everyone,
Found this in an auction and wondering if someone could help identify. My son and I have been talking about building an engine and stumbled on this. If this could be had for say $20-$50 would that be worth taking the chance. I could take a drive and look at in person prior to purchase but at that price point and with gas prices, I was wonder if it would be just worth the chance.
Thanks a head of time for the knowledge and help.


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