Sadly, this forum gets like next to zero for traffic, but it is posted in Talk and not Tech.
Yes, you will want caster camber plates, unless you like to buy tires. I HIGHLY recommend getting a bumpsteer kit. It does make a world of difference and if you saw the difference in the tie rod angles before and after, you would do it without question. Stock Saleens didn't see a terrible amount in drop height, but I can garuntee work was done in the bumpsteer dept.
Also, I would recommend a decent adjustable shock. In all honesty, will all the tricks it'll be really fun to drive, and handle 'decent' from a roadcourse/opentrack standpoint. You will need to go to a tubular K member with the different pickup points to really get the car to run with vettes etc.
cliffs- buy CC plates and a bumpsteer kit