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A good rule of thumb is to not exceed 15 degrees taper. On the bottom you might do 10 to be safe, although with a skinny rear and single wheel you'll have to fair it to get any meaningful flow patterns back there.
Definitely go to the Template sticky in the Aerodynamics forum and throw the template over it. Jim has a very good example there; use the same technique.
I think you mentioned getting rid of the sharp corners on the rear. You need those to help flow detach smoothly.
Cool project. have you considered doing something smaller, like a 500cc or even a 250? The car shouldn't need more than like 15hp to cruise at 60mph.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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