How do I make my 600 fazer faster?????

[mr self destruct]

Haven't looked at your link yet, but will when I have more time. I read that high lift cams work better with forced induction. Is this just an obvious thing or are there particular reasons for that?

Less overlap between inlet and exhaust valves mate.
I know on a classic VW Beetle engine the angle between the inlet and exhaust lobes are 108 degrees, but with a turbo spec cam they're 112 to separate the timing a bit and reduce overlap.
They do loads of performance cams for those cars ranging from mild street with high lift but limited duration (particularly for campers), to all out race with loads of both.