i have 40s on my zetec

get a megajolt ecu, this is for ignition only, and can be bought second hand for £100,

you can download maps off the net and load them on until you get it mapped, unless it runs well on a map off the internet you might not need it mapped.

you can use the same throttle linkage, just get a zetec manifold and bolt them together

youll need to sort the jets out in the 40's though, but people on here can tell you what jets to use till you get them jetted right

could have them bolted to your zetec and running for under £200, its the mapping and jetting that costs money