You need to reduce drag. Not just aero drag but mechanical drag. Look at everything and I mean everything.

I'll make sure to lose the dress.

Ok. I'll pack the dress.

How much power would something like that really save at the wheels??

Mr P, I have seen the results of a 998 block, 850 thicktail crank, 998 pistons , cut a lot off the block, custom thrusts, Metro turbo cam, 12G295 head ( ported ), a few other mods for reliability = 50hp, impressive result from a 930, we know this because a warm Sports 850 with RE13 cam dynoed at 47hp could'nt keep up

I don't know. But when you have very little power every gain is worthwhile.
You may find that with wheel bearings the ball bearings might have less drag than the roller bearings. A wipe of oil might give less drag than packing them in grease.
Not running an alternator will save drag.
Pot joints vs. Hardie Spicer vs. Rubber crosses. (my bet would be pot joints)
Drums vs Discs.

Production Coupe and Sedan: /PRO (Gas Only)
This category is intended to represent typical transportation vehicles which may be purchased from ANY automobile dealer. 500 examples of the model used must have been produced yearly. In keeping with this intent, the cars are aerodynamically "stone stock" with no body parts allowed which were not part of the manufacturer’s production for the series of the vehicle involved. The engine used must have been available in the model of vehicle used as purchased from ANY automobile dealer. Modified body, body panels, spoilers, air dams, etc. intended for, as accepted or sanctioned by NASCAR, NHRA, SCCA, IMSA, etc., are not permitted for use in this category unless specifically allowed. A manufacturer’s part number does not constitute an original, factory installed body part. Both exterior and interior body panels are considered to be part of a production vehicle and must be mounted in their original relationship to each other. A different displacement size of the same design engine may be used, provided it does not constitue an "Engine Swap" as defined in Section IV-12. Vehicles originally produced as a front wheel drive chassis and converted to rear wheel or four wheel drive chassis are NOT eligible for competition in the Production category. Choice of camshafts, carburetion, and ignition is unlimited. Cylinder heads are limited to original number of valves and port configuration.

That's a mod to the contour of the body though???