If you have the heads, I guess that would be it as long as they are complete and come with cams/valves/valvesprings/etc. I would suggest a larger throttle body as well, since you are going to have 10 to one compression or higher with the new heads.
Yeah as I mentioned above I will be getting the intake manifold as well. I was told I need a bigger heater hose too? The heads are complete, but they don't come with valve covers??? Where can I pick up some valve covers cheap? And people keep saying something about having to relocate a thermostat or something from the old intake onto the new one? Drill a hole???? CONFUSED ON THAT ONE???? The intake manifold is off an 03 but dosn't have the ALUMINUM crossover, is that bad?