Contact Barry R at survival motor sports. http://www.survivalmotorsports.com/
He is an FE expert and can tell you the best way to use 2K to get the most power.
I would assume heads and cam with some porting of your intake would give you the best power in this price range. I know a stroker kit will do it quickly, but I don't think you could afford the stroker kit and the heads to go with it on 2K.
Thanks, Josh