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Insulating the engine has little to do with overheating the engine, but all with retaining heat while not in use. The radiator keeps the temperature in check, and if that fails having no insulation won't save the engine.
Just to be on the safe side: do not draft at a few inches at speeds around 200 MPH. That is a lot less safe than insulating the engine. Maybe NASCAR is not the best example for ecomodding.
The better the aero, the harder you will need to retain the heat. Last winter at -12°C I had a hard time getting my Insight warm within my 22 mile commute...
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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