Not a common conversion to be honest. You would be better with a 16v (not the 1600 Zetec head) head which would increase response..

If you still want to stick with the N/A ZVH, go for the 2l bottom end and keep the compression fairly high. Don't over port the head (mild port only) and run a decent manifold and induction kit.

Other than that, all the block modifications are as the same as the turbo ZVH but without the oil return for the turbo.

How do you plan to run an ignition system?