dx3, The person at the DMV gave you some bad info. The easiest way to get it legal in Oklahoma is to file for a Title 42. Google Oklahoma Title 42 and you can view the process. You can do as Cletis suggested and do the Bonded Title route, it just takes longer. Do not take it to a Judge or show it to any LEO until you have some proof of ownership and are absolutely sure it is not stolen from a previous owner. If not tagged and titled along with insurance do not drive it on the street. If stopped, the officer, by law has NO CHOICE but to impound it and possibly put you in jail.
The find a 1950 title and purchase it, then get a repo VIN plate and attach it to the door post is done all the time. Since these trucks don't have numbers stamped on every part, it is easy to get away with doing this, even though it is illegal.
Don't give up, it can be done. Then hop in and drive the wheels off it.
