I found this
http://www.saac.com/articles.htm
As it turned out, only a handful of either models were brought to SAAC-26 and none were planned to be raced. But when only three Cobras made the grid - stalwarts Robert Andersson (in CSX3176), Bryan Appleby and Jerry Streickert (both in CSX4000s), Shelby dealer Jim Harrell and Shelby American’s public relations director Gary Patterson commandeered one each CSX4000 and CSX7000 Cobra racers and joined the action. The GT350 race was the equivalent of red meat thrown into a cage of fasting tigers. Seventeen cars made the grid and promised an exciting race on Sunday.