A member was recently looking for a screw-on/off gas cap to replace the locking gas cap. Is your cap a Stant or other name brand, w/a part #?
Get your wheels vapor-blasted to rid your wheels of oxidation, and to give them a nice satin finish. You could also use baking soda as a blasting media, if you cannot locate someone close-by doing the vapor blasting. Either way will give you a satin finish, without the texturing that sandblasting does. Then you can either polish the wheels, or have them powdercoated. You may choose to leave them as they come-back to you, cleaned of oxidation, and just keep them waxed and clean.
HH compound front brake caliper pads and woven stainless steel brake lines will give you a better stopping performance than organic pads, which may be what are on there now. Those (organics) tend to deposit a lot of brake dust on the wheels. Look on the back of the pads and there probably is a brake pad compound inking on the steel plate. Any name-brand HH rated pad should work well for you. Among a complete fluid flush, changing to stainless brake lines, and the HH pads, you will be getting maximum benefit from the stock 298mm rotors and 2-pair opposed piston front calipers.