2.) Yes but they are race car cams.. You won't be happy with them on the street. They make more power, but at the expense of less torque at lower rpm's. (where people actually drive)
3.) Yes, Eurosport, (see Sunbelt...) There are also some reground options. None of them worth a crap...
4.) 7200 Rpm. Done. Yes it's the lifters, yes it's chrankshaft harmonics. What the engine to spin faster, put a S54 in.
No matter where you go, there you are.