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Re: Engine block I.D.
TDB is either `72 307 or `80 350, you`ll need to look at the date code at the back drivers side just below the head on the block to determine year and or the gm block casting numbers.
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`64 C10 vortec 350/350/373 posi
`69 RS/SS 350/350/308
`37 Ford 406/350/324 traclock
`68 Dart 370/904/323 suregrip
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