the SS tranny (auto) fails early and often on stock settings, so adding a SC to that mix might just make things happen faster. What would be an all around more effective mod, for roughly the same price, would be a SS to manual swap, because honestly, it's worth it. it'd cut a full second of your 1/4 mi, and not to mention give you a more reliable transmission and better gear selectability.
We just had this discussion over @ HT.com and the consensus is that the 30%+ driveline loss found on cars with an automatic transmission makes doing any sort of engine work or FI work frustrating...SS Guys that have $4000 turbo kits are dyno'ing similar numbers to 5spd owners who just have I/H/E...
Not sure what the going rate for trannies is, but i'm sure for the price of a JSRC, dyno time, etc, you could get a tranny and a quaife which is much much cooler...