Hi Jim,
You're welcome to use my car if you like. I run an Optima battery in the trunk with a fancy shmancy billet battery tray(!) and I actually live in Del Mar and I'm already registered for the event. I was the December featured car of the Month here a few months ago so maybe I might meet your requirements.
My link here on Lateral-G is:
https://lateral-g.net/members/robinson/
I also have a website here:
http://www.69camaroproject.com/index.htm
I believe there are pics at both sites that show my Optima battery setup in the trunk. You'd be welcome to put the sticker back on the battery to make sure nobody gets confused.
Feel free to contact me at:
[email protected]
I'm shooting you an email also.
-Chris