This same question pops up very often. The best thing is go to your own local DMV and find you own states laws.
This donesn't help you much but you should have insisted on a clean title, in the sellers name, before you handed him the money. I learned a long time ago that you have got everything you are going to get at the point of sale. Promises that they have some missing parts, title ect. that they will get to you later almost always end up not being fulfilled.
In most states and old title with a previous owners name will need accompanied by a bill of sale from the owner whose name is on the title. If the back has been filled out with a buyer who isn't you, the title is pretty much worthless anyway.