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There's a lot of detail work that can reduce drag significantly. Things like eliminating seams (taping them over or changing to bodywork that doesn't have them) can make a difference.
Rounded corners can make a difference. Though I think at the rear you'd want a small lip to promote clean separation?
Tunnels under the body are one way to get downforce without much drag. Most wings and such will increase drag; a well-designed one will give you more in downforce than you lose from the drag. (At least, on cars that go around corners! Not sure about the straight-line folks.)
Reduce the frontal area of the vehicle. Introduce plan taper at the rear. Vertical taper will not help downforce; plan taper should at least not make it (much?) worse.
Probably the easiest thing is to lower it and put an air dam on it.
Wheelie bars can help keep weight on the front tires, but they will add some drag, though more mechanical drag than aero.
-soD
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