The engine is just an air pump. Make it easier to get in and out. Better air cleaner does help. Make sure your compression is pretty equal and then make sure your cams are timed right on. If the belt stretches, it will effect power, usually losing low end power and gaining upper end by retarding the cams.
Get good fuel in it and get the timing as advanced as you can get and still starts smoothly. Too much timing and it will be hard to start and can run hot, so a better cooling system would be a necessity.
Definately a better exhaust system, bigger and headers. You could even block off the EGR valve if you don't have to worry about emissions, your lower end power would go up a bit from that.
Of course NOS and turbo charging would be great too. Good luck
Russ
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