Go to your nearest motor vehicle building and explain what you have and just bring all the receipts that you have. When I register my 37 all I had was the Bill of sale with the formers owners registration. I had a chevy 8 in there and that was on the previous owners registration and thats all they needed. It took me 10 minutes and it was done. All they really want is the vin number. As far as engine numbers can't rally explain why they would want that.