5m-ge future engine mods?

[mechrider89]

does a re manufactured head come with all new components? as it sits right now I may end up just buying a valve spring compressor and pulling the valves myself. Then going to polish the valves and domes, port the intake and exhaust runners, so hopefully when I get the pacesetter header it'll be about the same diameter so I get a good flow.

As for miles well my supra has 263k kilometers which is like 165k miles, I've heard of these 5m's getting well into the 300k miles with proper maintenance before calling it quits.