The answer to your question depends on two things: 1.) How much money do you have? and 2.) How long do you want it to last?
2000 HP wouldn't be unreasonable if you were to invest - say $35,000 and expect it to last 4 to 5 minutes.
Seriously, when you do the hop-up tricks discussed repeatedly here, Carb, Cam, Head, Ignition, Exhaust, and Compression will run you about $800.00 and get you 160 to 180 HP.
Good Luck