a cvh is best as you can get them with a carb as for the zetec every one needs a wiring loom fitted and fuel pump ecu ect ect

depending on what cvh you use its a strate forward swap if you get the cvh out of thr fiesta turbo it will bolt strate up just rember to get the shafts breaks ect ect but that also needs a wiring in

if you get the cvh out of a fiesta mk2 xr2 or a carbed cvh of some sort you can use the fiesta turbo top mount and will bolt strate up

as for conversion guide a hanes manual has got very good instructiona in removing an engine

as for putting it back in just do the same in reverse

hope this helps