it depends upon your budget.. if its reasonable I would do a CVH as you can get reasonable performance out of them at reasonable costs, if you have a decent budget I would go with a zetec turbo as ultimately its a more modern and better performing engine providing that you do a quality build.. Do not keep the standard pistions and rods or use a decomp plate or skim the pistons you because when you start upping the boost the engine will not be able to cope.

The whole ZVH thing misses me completely as the standard 16 valve zetec head is good for flowing to 300+ bhp from standard while the porting required to obtain the same level of flow from a restrictive CVH head makes it costly... when you take this in consideration with the additional work required to block oil ways etc and the fact that this conversion has no real advantage over a full zetec I really really do not understand why it is done so often