options
I would go for door number 1, that engine has a good prior build date and a large amount of related parts that if checked probably pre-date the engine build date. The distance between options 1 & 2 is only $300, and in my humble opinion, easily worth the extra money to get the correctly dated additional parts. As far as matching numbers between this engine and your car, the build timing is excellent, you could always have your engine builder lightly "kiss" the front face of the block down near the serial number (couple of .001s) with a milling machine and yes!-stamp your serial number in. It is not illegal in any of the contiguous 48 states because you are not touching the allmighty vin tag, and the corvette restorers do it all the time- I know, I live that life too. I am sure I will get alot of hate mail for this last recommendation-so bring it on!!lol.
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