You need to look up your closest REGIONAL office of the dmv. The fort worth one is on Gravel drive off of 820 and 30/121.
Get the vin off the car. Get a pencil etching of it just in case. Most of the time they dont ask for this.
Also, bill of sale helps but its not required.
Anyway, go into the office and tell them you have a car that you bought a while back as a fixer upper and now need a title. They will get you to fill out a form. Fill it out as a RUNNING car. If you put that it doesnt have an engine or whatever they might not let you do it. clunkers crap.
Anyway, they will give you a number based on the cars value x1.5. 1991 240sx is 950x1.5. Then, walk out the door and around the corner to your left (if you walked out of the door.) There is an insurance/bond company right there. They will charge you based on the number. Mine was 125 bucks.
They will print stuff out for you. Take that info to your local tax office that you register your car at. Pay the normal registration fees and BOOM your done