If you want to go sleeper style, pull that motor out of your GS-T, and drop it in a '94 Hyundai Accent or '91 Mitsubishi Mirage hatchback. 'shaves about 1600lbs. Nobody will see that ass-whoopin' coming. You can build that whole car without gutting your Eclipse for under $4000 if you have the time and skillz, and easily run 11's. Of course, the Sol might get better gas mileage.
B18 would be ideal unless you already have the DelSol VTEC model to start with. My guess is that you won't on that budget.
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