How much faster do you want it to be?
My 92LX has an effeciency chip from Superchips ($250) and K and N airfilter ($30) and it accelerates pretty damn well for a 2.3...of course mine was factory rated with 17 more horses than yours.
A chip+airfilter should give you a noticeable difference, but it still won't be "fast" by any means.
If you want to make your car pretty quick (able to kill any V-TEC you meet), do the previously mentioned mods and then swap out the rear end gear and put something like a 3.73 in (take it to the shop for this, about $400), and buy a nitrous oxide induction kit and give your car a 30hp shot ($600-$800).
There are performance heads, cams, and other more sophisticated mods available, but to me its kind of ridiculous to do all that to a 2.3...if you want REAL performance, and not just good driveablity, buy a V8 (this doesn't mean I don't love my 4banger, it does its job well).
As for the dents if you want your car to really look good, I'd take it to the body shop.
No idea about the interior.
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