1) No the TB from a Focus wont work, maybe, just maybe you could switch over the Focus manifold also and get it to work.
2) Ye s the crane cams will work, go to the crane cams website and look in their import section for all there offerings for the Zetec. They also offer a whole new ignition system.
3) yes the coil will work, but I'm not sure which plug wires will be compatible with it(the only reason I don't own it already).