For 600+, you should consider a set of cams. Head work and oversized valves arent necessary, but the cam will push your power curve to the right, and allow you to make good power nearly to a 7000rpm redline. You will find, that better flowing heads willa llow you to achieve more power at every given boost level.

Aside from that, its all the usual suspects. such as rods, pistons, studs, fuel system upgrade, 650cc injectors, Drive Shaft Shop axles (We are distributors of them), ATS carbon twin or triple clutch..etc..etc... It's quite a long list of stuff, to do it correctly and completely.

Lemme know if you need some help. I have some pre-generated estimates, from all the packages I have put together for people in the past.