Its not displacement your after its power. You did a great job with what you had.
Your options:
1)internals on your current motor and a new blower 400rwhp or so
2)internals,blower and heads 430rwhp
3)stroke,bore,blower,after cooler,internals,heads,cams,475+rwhp
4)03 cobra $22,000 + procharger $3,500 installed= 600rwhp
5)cobra, aftercooler,50lb injectors,fuelpump, 750+rwhp
The cobra will run like a daily driver, 18mpg, will take 1 day to set up, and will run 9s at the track.
Your options:
1)internals on your current motor and a new blower 400rwhp or so
2)internals,blower and heads 430rwhp
3)stroke,bore,blower,after cooler,internals,heads,cams,475+rwhp
4)03 cobra $22,000 + procharger $3,500 installed= 600rwhp
5)cobra, aftercooler,50lb injectors,fuelpump, 750+rwhp
The cobra will run like a daily driver, 18mpg, will take 1 day to set up, and will run 9s at the track.