it really depends!!

If your running for points in a Bracket style. You can leave your 1/4 mile set-up and fall into what ever class / dial-in your car will run.

If your running Heads-up/Index and need to run both 1/8 & 1/4. It would be best to have a 3rd-member style rear-end and 2-3rdmembers set up 1 for each track.

I know a lot of outlaw guys that do this.