I wanted to go zetec and still do but ive got a all singing and dancing cvh now for my escort

To fit a zetec in the mk1 bay both inner wings need modding because you will also need to do a 5 speed conversion

For me it would be a standard st170 on 45mm jenvey throttle bodies with dta management with the vvt properly controlled and will make over 200bhp with an adjustable exhaust cam pully set up correctly

If you do get a crossflow let me know a friend owns wacky performance engines w-p-e and he's just done a 175bhp x/flow on carbs