I played with Mapquest and found the best route to ask for from I-30 is as follows:
Starting Point: I 30 & N State Line Ave, Texarkana, Arkansas 71854
Ending Point: 217 Laurel Street, Texarkana, Arkansas 71854
This will give you an almost straight shot from the Interstate. Also, as you exit from I 30 you will see the Holiday Inn referred to in some of the posts.
Looking forward to seeing those great cars!