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All Y blocks look pretty much the same externally, so check casting numbers on block and heads to be sure of what you have.
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GOOD POINT!
And it actually goes beyond that. All look for the ID MARK on a 312 C/S and if there assume the engine is a 312. It may be a 312 crank was used on a 292 making it a stroker.
If you want to be 100% sure of what you actually have and intend to rebuild/modify is to put it on a forensics table.
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"Last Sunday, I caught him makin' eyes at Idell Bushey durin' preachin'. And I know what they do up there in the hills when they say they're possum huntin'. They're just sittin' around the campfire, drinkin' hard cider, hittin' each other on the shoulder and hollerin' 'flinch!'."
― Charlene Darling (Daughter of Briscoe Darling)