Update- I followed the suggestion made by DJ194950 and had a Vin verifier come out and confirm engine number on the frame.
I also retained his services to see if he could get a title, registration and plates. The good news is that he was successful with Ca. DMV and I will be receiving plates and registration in just 4 days! From the time he came out to verify number to when I will get documents will be 1 week! I now can proceed with confidence that this 49 Suburban will see the road once again.
Thanks for all the comments and advise!