This is probably a shot in the dark but if any place can get the correct eyeballs to view this ad, The Early 911S Registry is a great medium to carry the message; Here goes:

I am looking to buy the original engine (according to Certificate of Authenticity from Porsche Cars of North America) that came with my 1970
911S. Of course it is 911/02 code and the engine Serial Number I am looking for is 6300539. If anybody has this engine in their car, and may be interested in selling it, please let me know and we can work out a deal that you will be very happy with. If you absolutely, positively have no interest in selling it, I understand and that's cool, but please let me know anyway if you have it. I am very curious as to the whereabouts of the original engine to my 70S. Thanks in advance.