Fuel should be your first priority. Bigger injectors, fuel pump. I think the general consensus is that, stock lines are safe up to about 450-500. You can see in my sig, that I started getting lean @3200. 255l intank, stock lines, rails, and 42#inj. I now have the glennsperformance.com 950hp system.
I say get a fuel system or build one yourself. You def. want to forge the pistons at least, and add a girdle. What cat-back you running? If you are running a chambered muffler, you are holding up some hp and tq #'s too.
IMO- your top end, including cam, looks good for what you are trying to accompish.