Not to discourage you but first of all your '38 La Salle will need to be a RACE CAR. Make sure you read all the rules not only for the "class" you will be running but also the "catagory" the class fits in. If it is a street legal normal car right now you may be looking at $5K to make it SCTA legal for almost any class. IE: roll cage, door net, racing seat, possibly remove interior?, tires, wheels, fire suit, fire system + more
You may want to print out an inspection form, found with a little searching in the SCTA-BNI website. It will show everything which will be checked off during inspection. In the coupe classes you need to do some of what ever is needed to meet the body rules to run the class so under standing the book is important.
Good Luck we are always glad to see someome bring out the vintage iron................JD