I've seen a few st170 conversions and some st170 heads onto blacktop zetec or silvertop zetec turbo projects. A lot of people do not run the VVT as you require some extra work in order to run the VVT such as ST170 loom or custom loom with custom management that can run VVT and have that mapped in or featured on the ECU so it can control it.

I think its been done before I'm sure I seen it but dont know where to find it