The first numbers of the engine ID indicate it's a 248 cubic inch. Someone else will need to decipher it beyond that information as I'm not terribly knowledgeable about the particulars of GMC terminology. Is there some reason to tear it down rather than to try to sell it as a complete engine?
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
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