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That is a casting# meaning that was the block # which was one of several that were used to denote a small block v-8. That number was used from the mid 60's through early 80's. to find out what you really have youneed to look on the front of the motor on passenger side. Below the head you will see a small flat area called the pad. On it will be a couple of letters. they will tell you specific egine type. and letters will tell you the date
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