I failed to mention the OP could also hit up Saleen. They probably have more direct knowledge with endurance racing for more than anyone else come to think of it. https://www.saleen.com/contact/
Back in the 90s the Saleen Mustangs were all the rage and they put out automatic Saleens as well.
To this day I still want a 1994 screaming yellow Saleen s-351R! I saw one in my life. I was on the 710 freeway in California and I thought I heard a flash thunderstorm or something. Looked to my left while I'm in my towtruck and a yellow Saleen s-351r flys by me in the fast lane. Man that supercharged pushrod engine was so loud and sounded so good!! Only thing close to that rush/sound is the new Hellcats that can sound real mean and nasty.