You can take out your back seats...thats about 10 or so...
But if you are concerned with something that also looks good, American Muscle sells a Rear Seat delete kit..so does Rear Seat Delete.com
Other things you can do...are taking out the trunk panel...thats a good 2-3 pounds...and of course your spare and jack(I'd wait til I actually got to the track or DYNO before I took it out)
But these things are just nit-picky..if you had lots and lots and I mean LOTS of money, you could have all your sheet metal panels replaced with Carbon Fiber ones...that would reduce A TON of weight.
I know a guy here who has an S-95 with a Carbon Fiber body..it also has a 10 1/4 mile and is a V6

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Bama Race Tuned, LED Taillights, 6000k Headlight HID, TCI Shifter, Push Start Ignition, 4.10 Motive Gears, Ford Racing T-Lok, Foose Hood/Fender Stripes, Rear Seat Deletes ,Rear Window Louver, Flush Quarter Window Louvers, GT Spoiler, C&L CAI, X-pipe, SLP Loudmouths.
When the weather warms up, the V8 owners will have hell to pay
"I'd rather drive a V6 than run around like you on those Chevrolegs"