Two choices silver or black top both are much the same the black top is better if your going to a higher level of tuning.


Silver top may be easier to find again not much difference between the 1.8 and 2.0, people say the 1.8 rev's better if you go for a 1.8 fit it with 130bhp or 2.0l cams also whilst its apart get the fly wheel lightened and change the rod bolts for ARP ones as they are a week point if revving it hard.


My dad has a mk2 with a 1.8 with 2.0l cams bike carbs and it makes 150bhp it has a RST lsd box and it fly's.


You will need a lot of parts from a xr2 or a cvh powered fiesta to fit a zetec these bits are getting quite hard to find now.


Take a look at this web site it has a guide with details of all the parts you need and how to do it.


http://www.zetecinside.com/xr2/stepbystep.shtml


Locost is another good forum with information on the zetec and getting it running cheaply.


http://www.locostbuilders.co.uk/forum/


Good luck,