For sure Gum Valley is an excellent track, long, wide & very fast( so says Daniel Reardon, who gets along pretty well himself ). I've ridden it a couple of times, and it really suits the open class bikes. Great organisation & facilities, they encourage the vintage guys, and the trackside crowds are largest when the old bikes are racing. I'm sorry this year I won't be able to go, and crank up the VB.
Ideal track for some of that Rotax power in your Special!