on older bolts the vin# was the engine number. if you still have the original engine there should be little problem. a replacement plate could be made with all the original numbers. on later bolts, there is a confidential number on the frame that matches the vin.
counterfeit plate are usually pretty easy to spot, and i won't go into great detail about how to do it, but don't think law enforcement is totally ignorant to the practice. a few years back a pretty large chop operation was busted by a street cop who became suspicious on a traffic stop.
despite all the free advise on the internet, i suggest you contact your state department of motor vehicles, explain your situation, and follow their advise. it might be a hassle, but i suspect being married to the biggest dude with the most cigarettes in your cellblock would be a hassle as well. (or not, depending on a person's individual taste).
i am sure like the other bolter here you are honest and above board. too bad there are those who are not quite that way. that's the reason for the hassle.
do it right, and protect your investment and save yourself some grief.
just my 2 cents
