It isn't too hard to get that much HP out of these engines. Most all the top name piston companies offer pistons for these engines, so you wont have any problems with that. A roller cam wont be needed to reach your goal unless you just have an extra $600+ to spend just for the cam. There are a bunch of guys in Brazil making 450 HP on the street with these engines using DCOE Webers, so you should be able to do it with no trouble.
