69 340 and 4 speed trans

BB-Dave said

4spdragtop, seeing a 7-10-69 casting date must be for a '70 car. 171363 is the last digits of the vin, so it's a '70, late '69 would be like 4XXXXX.

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Thanks Dave! Sorry to hijack the thread here, but maybe someone can answer this?? I have seen engines on here for sale that arent orig to the sellers car, but they know what the engine came out of....how do you decipher what the engine originally came in??

Thanks and a bump for your sale!!