Words of advice when tuning the roush.
When you put on the smaller pulley I am assuming that you will be hoping for 12psi.
The stock AFR from roush can be leaned out to about 11.95, and then the timing can be bumped up to almost match the MBT table. You may also want to raise the maximum Throttle % at all RPMs up to 80%. When putting in longtubes disable the rear O2s, and up the base fuel a little bit (~2%). You can set the max wheel torque error to 50,000, reduce the value required to enter WOT to remove the minor delay that you'll experience in fuel compensation for WOT.
ChangeMax MAF count to 1023, and MAF min to 50. This will allow your MAf sensor to read more accurately at the high volume your supercharger will make with that pulley. Also set Min and Max Barometric to 27 to disable it so that it doesn't screw with your WOT fueling.
Change the Open Loop delay ramp to 0, and set the Open Loop delay blend to 0.5 > This will make the car respond to WOT better by delivering the AFR change faster.
Also set the CYL AIR WOT MULT to 1.9 so that your car never goes superlean.
There can be more to it, so feel free to PM me if you have ?'s.