Ls vtec question?
 

So i have a ls vtec in a ek and i want to make the engine more stronger so i can handle higher rpms cause i no a stock my block cant handle high rpms for cuz the r/s. Question is what shoud i upgrade first the pistons rods crank w/e i mean ima eventually upgrade them all but im doing it one at a time if possible

get high rev springs and intake and cams