right, i'm considering a new project, but i need a few pointers to help me along my way

the plan is to build a 24v twin turbo 4x4 capri (hopefully)

which gearbox setup is best for the car/engine?
which turbos, and will i need to get custom manifolds?

if i was to get hold of a sierra xr4x4i, could i use all the transmission and stuff from that?

does the capri shell need any modding for the 24v lump?
does it need wide arches for the 4x4 transmission?

i'd be running mappable management (gotech mfi pro), so ecu wont be a problem really

sorry about the questions, but im practically a newbie, and my ford parts compatibility knowledge isnt too great

any help would and hints will be much appreciated