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I agree with the others here regarding the kamm. The stang you have has a great rear profile and I'm certain Ford has optimzed the flow off the back, so anything you do short of a full kamm will certainly degrade the Cd.
Grill blocking I think would certainly be a way to gain aero efficiency. Modern cars are designed to keep cool while going uphill, with a full load on a 120 degree day. If you block the upper grill area, I'm sure there would be enough air through the bottom opening to keep you cool.
Also you mentioned accelerating slowly, you may want to look into driving habits more to rethink that. It is counter intuitive, but you should accelerate while your engine is running at its peek BSFC efficiency, which for your car may get you a ticket for display of power er something.
Hope this helps.
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