Jimbo... You'll have the time of your life!!!
Make sure when you get a helmet that is has the "SNELL 2000 Approved", or later, sticker inside. It's normally under the padding. If it has a "SNELL Approved" sticker on the outside only it can't be used at a SCCA event.
No other mods are needed.

Just add some air to your tires after you get to the event. I typically use 41 lbs. front and 39lbs rear. Make sure you go back to 32 front and 33 rear before you hit the streets. Enjoy!!!