Actually it would have about 450 horse power. and the engine mods would be A supercharger, air intake and timing. Theres no way you can mod all but 3 things. You could leave the block the heads and exahst possibly but you wouldnt be abloe to put out over 600 hp and even if it did put out 600 hp you would totaly blow the block apart due to the amount of compression needed to make that kind of power.
it was my dads till he sold it to his best friend tyson my dad never had the time to ride it so he sold it for like 100 thousand this thing is one hell of a beast
Regina, Saskatchewan, Canada 
and the engine mods would be A supercharger, air intake and timing.
Theres no way you can mod all but 3 things.
You could leave the block the heads and exahst possibly but you wouldnt be abloe to put out over 600 hp and even if it did put out 600 hp you would totaly blow the block apart due to the amount of compression needed to make that kind of power.