I did a search in your state for what you need, here are the listings and forms to process it through the system;
http://dor.mo.gov/mvdl/motorv/forms/3019.pdf
In case you get mis-directed, here is the master page;
http://dor.mo.gov/mvdl/motorv/help.htm#title
This page is a bit on the mis-leading side and you should pay close attention to the requirements. You will need to certificate of odometer reading with the VIN inspection. If you dragged the beast home, you need to get a signature from the property owner who gave you the beast and if you can talk then into allowing you to have them sign the duplicate title forms, it would be in your best interest over all. Have them gift the hulking mess 100% to you, hence you most likely will only pay a tax on the scrap weight.
If you dragged it home from some unknown area inthe woods, it would be to your advantage to file the general form on abamdoned vehicels. Here in Utah, we just file a statement of ownership, also known as "claim jumping".
Here is the form for you to file in this catagory
http://dor.mo.gov/mvdl/motorv/forms/768.pdf, it works every time. Take planty of pictures, give the weight value quote from a local scrap yard to validate your claim of worth. And you are good to go. This the very same sequence I have followed in every state I have lived in over the past 30 years of claiming abandoned rides. It takes about 30 days to get a title.