Hello, I am planning to do a cylinder head overhaul. These are the parts I have ordered:

1. Cylinder Head Gasket
2. Inlet Valve
3. Exhaust Valve
4. Valve Stem Seals
5. Valve Guides
6. Valve Seats

Parts guy have recommended me to replace the following too, hence would need the input from you guys:

1. Lifters
2. Valve Springs

Is it necessary to replace them as well? My engine has that light "Clattering" sound at high RPMS.

Would also appreciate some good advice from you guys as this is the first time I'm doing this.