Pulled engine from 66 fastback this weekend and this is the block numbers I found. My question - exactly what is this and what from?? I believe is a 351W from from 69, but not sure. Also, has partial serial number on pad at the back of the block - 0A222199 - what does this tell? Lastly, then removed valve covers and found 289 cast in the heads, along with 66. What do you all make of this combination? Is it worth time and effort to pull apart and rebuild - did not smoke when started in the fall? Thanks for you thoughts!