Definately agree with SufsRS mate, a well built ZVH conversion is both well worth it and reliable IMO...

Lots of people on this site have them alone and persoanlly i'd probably go with one of these over the CVH, you get much better torque from the Zetec Bottom End to start with

To be honest aswell, i'd say they were probably easier to tune aswell!

Why dont you ring a couple of tuners and see what response you get, dont listen tom pub talk mate, never worth it! HTH