You'll need the brackets for alt and PS pump (if you want to keep it) from another zetec. Doubtful KA HCS ones will fit the zetec block, though I know CVH alt brackets do so maybe...??

Most importantly, you'll need some way of fueling the beast. Either carbs or injection.
For injection you'll need the zetec stuff - KA stuff wont fit (different inlet manifold, injectors..etc..) and wouldnt fuel enough anyway.
If I were doing the job I'd bascially follow one of the many 'CVH to Zetec' conversion guides as they cover pretty much everything, albeit in a slightly different car:

https://passionford.com/forum/pictur...uid-guide.html

Couple here, incl wiring:
http://xrtwo.speedcentral.co.uk/viewforum.php?f=4

For a KA you'll need to either buy (if they exist?) or make custom engine mounts as the usual CVH cut and shut ones wont fit, the KA ones wont fit and the Zetec ones definately wont fit (they're almost as big as the car!).
Sorry if this is all obvious. I've no idea how much you've looked into it already.