Sorry I didn't see your post earlier but we used the following frequencies,
Primary 146.700 MHz output
146.100 input (-)
Repeater Tone: 156.7 Hz
Backup 147.140 MHz output
147.740 input (+)
Repeater Tone: 141.3 Hz
We've used those for the past few years now. As always check
www.sno-drift.org in the weeks leading up to the event. If you're a ham they're always looking for volunteers.
BTW, the SCCA hasn't sanctioned stage rally events since 2004. Rally America is the sanctioning body now,
www.rally-america.com.