Hi Mike,
welcome to the forum
i,m using the 1.8cvh engine for the first year on the road then plan on installing a 2ltr zetec.
if you use a 1.6pinto first then go to a zetec please be aware that the exhaust outlet is on different sides which would mean re working your side panels etc.
cvh = passenger side exit
zetec = passenger side exit
pinto = drivers side exit.
hope this helps a little with your choice of engine.
cheers
andy