Thank you all for the information and advice. I have a '29 Roadster with correct title that belongs to the car, that has a different engine and is on an original, but not original to this car frame. I'm not trying to counterfeit anything or do anything illegal, but I want to "marry" the body and title by adding one of the patent plates that has a place for the VIN to ease any potential headaches with registration.
I have the same issues with my '32. A prior owner "upgraded" to an aftermarket chassis and a later model flathead so it's numbers don't jive either. A very crude and obviously homemade aluminum plate with the VIN stamped on it done by a previous owner got past the local deputy sheriff, but with no VIN at all visible on the car it would be a major hassle and I'm simply trying to avoid that. I even told the deputy that the VIN would be on the frame rail under the cowl but that both the engine and frame had been replaced. He said "okay, as long as it's there I don't care how it got there". Things are way different in rural America than they are in Los Angeles. AND, I have copies of the last two titles and a Bill of Sale proving that the car is legit and I am the rightful owner.
Thanks again.