Does it have to look stock on the outside?
A Superbird nose and a plexiglass cover over that back window tunnel would gain a few mpg, whatever else you do. Forget the coat-hanger spoiler.
http://www.rollyrocker.com/roadrunnersuperbeemain.htm
Quote:
1970 Plymouth Superbird- 1970 Mopar technology
- drag coefficient better than many 1990s cars (.28)
- capable of speeds over 150 mph, stock! (max. 180 or so)
- considered ugly at the time and a poor seller
- standard 440 and optional 426 Hemi.
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A bellypan, wheel spats and a diverter would help and they're all underneath.