Defintely a good thing. Getting into racing a couple years ago was the best "car" thing I have ever done, bar none. One of the reasons why I am not here on the forum much any more, also no point in being here since I have no foreseeable GT40 coming my way in the near future. This post just attracted my interest on one of the few times I've stopped in over the weeks.
We now have six company race cars (built five of them) and I drive SM's fairly frequently. Wheel to wheel racing makes other on track events pale in comparison - it is really hard to go back to a track day again. SCCA SM is National in 2006 though and competition is heated already, it'll be really tough now.
You'll need to get a trailer for the car - it won't be competitive with a converter or muffler (you could do bolt on and off sections) and the suspension settings you'll need to run decent will wear a set of tires out in no time flat. If your distance is short you might get away with it, but running shaved Toyo RA1s on the street with at least -2 neg camber in front and -2.5 plus in the rear with some decent tow out up front makes for a rather twitchy street car, although I do it for short distances to ferry around.
You might laugh at my comment about power/mufflers, but if you start racing you to, will be scrambling to have 2+ hp on a car that struggles to make 110 rwhp without cheating. Our two high mileage cars, 195k and 130k, make 108 rwhp and 114 rwhp on stock motors with only SM legal changes, not bad since some struggle to make that with fresh crate motors. I've driven both back to back and 6hp, believe it or not, is like night and day.
Pay attention to the cage in your car too. A welded in built custom cage from someone that knows what they are doing makes a huge difference in stiffeness, obviously, and vibration modes. And, it makes a difference in handling. I've had the pleasure of driving well caged cars, and, bolt in but welded cage cars - again, night and day. See what you've got and if yours is not like the front runners in your area, make it like theirs.
Maybe we could trade some west coast/east coast SM seat time. I just had Malcolm and Jools over from the UK, both
www.gt40s.com forum members, to run the 13 Hour Enduro at VIR, The Charge of the Headlight Brigade. Fantastic stuff and I think Malcolm will post a report soon. Thead here:
http://www.gt40s.com/ubbthreads/showflat.php/Cat/0/Number/66646/an/0/page/0#66646
Anyhow, hope you enjoy it, I know you will. Only think I can say negative about the cars is that they make you feel like Superman - brakes NEVER fade, handling is impeccable - it can be as loose as you like or push like a front driver depending on setup, and it is so easy to drive due to light controls. And of course, as mentioned above, on power tracks you can read War and Peace on the straights. Let me know if you want to come East and do some racing sometime, we can set you up in one of the SMs (we've got three) or one of the other cars that is a little less "tame" but more rewarding to drive.