I'd like to start gathering parts to build the head of my motor. Are there specific valves and valve springs / retainers for the gen3 or can I use gen2 parts? Also, would anyone recommend running larger valves?

What I'm looking to buy :

1. GSC s1 cams
2. cam gears - recommendations
3. ferrea valves - possibly oversized
4. supertech dual valve springs or single (I hear duals are better but require some fab to the head to fit)
5. gen3 timing belt - hks or greddy

Any info is appreciated. Thanks!