Only reason I ask about which head with cams to use is because KARL said in a recent post:
There are many ways to design such a 300 hp zetec turbo engine:
1 - bigger cams and much more rpm - thus lower boost required to achieve 300 hp.
2 - factory cams, restricted intake, low rpm - thus much higher boost required to achieve 300hp - more prone to self destruct.
3 - High flow heads, intake manifold, and exhaust manifolds, high efficiency intercooler, performance cams etc.. = now really low boost levels to reach 300 hp.