Besides dropping the suspension i cant really think of much more you can do to get the handling better, maybe give it some negative camber, just a bit more grip. Personally i wouldnt recommend taking the rev limiter off, if you intend to do that then i would presume you want to take the revs past this mark, which isnt good because if you do that on a regular occasion you could really end up ruininga good engine, hence why they put the limiter on in the first place. Your best bet to the engine is either fit a standarish induction kit, or upgrade pistons, camshaft etc or if you can afford itget it supercharged or turboed.