fiesta rs turbo bits wont be any good as the turbo is on different sides of the engine to yours

you could thow in the whole rs turbo set up and use a mk5 escort cvh powere steering pump and covert your power steering system to work with it

but i would (if i was you)

get a 2.0 silvertop zetec and strip it down and use c20let pistons with the standard rods machined to fit with these and then fit arp rod bolts and focus rs gaskets and plugs and devil development valve springs, this will be good for 270bhp

then use a stage3 t3 and ofab management from a fiesta turbo and get a ofam ecu from boost monkeys and plug into the ofab set up.