Anyone know how to get a 1928 rat rod titled and tagged?

Hey guys I am looking at buying a 1928 ford tudor sedan ratrod. It's very cool, chopped, dropped, and has a turbo charged 350 in it. But after seeing the car and coming home and kicking the decision around for a long while. I'm going to buy it to resell. But anyways I decided I wanted to go ahead and do the deal. I called the guy to ask him some more questions and it occured to me that I forgot to ask if he had a title. Infact I met him in town with it and it had a plate and tag on it. Turned out the guy is a dealer and he had his dealer plate on it. And it doesnt have a title. the frame it is sitting on is completely custom built, so no numbers to go off of. I live in Oklahoma btw. But how would I go about getting a title for it? Or is it even possible to get it street legal without any major numbers for it?