hey Dirt,
Just thought I would try and help you with an Idea or two.
Try going to some of your local independant(the small one)auto parts stores or auto salvage's or the small time car lot. Most of them guys like to have advertising for a inexpensive price. Tell them exactly what your doing and what your goals are, don't exaggerate, just say something like I would like to finish in the top 10 and maybe get a win or 2. Racing in a race car is nothing like a go cart, you can't use body language in a car. What im saying is you might be a champion go cart driver but a sprung chassis of 2800 lbs. will be a challenge for you. If you do well your first year the sponser will come to you. good luck hope you find that sponser.