It had a 160 t-stat in it and with no fans running it would take entirely too long to warm up during the winter, sometimes I could see the temp needle drop just before staging. That was the reason for the lean-out valve/vacuum leak. During the summer the pits and return road are usually too crowded to even bother. I have no patience.
One thing I forgot to mention. If you plan on letting the car sit for a few weeks it's a good idea to drain the alchohol and dump some gas in the tank. Run it until you smell the gas and shut it off. That way the alcohol doesn't eat up your seals as fast.