Hi
I'm another 1 who's done this converison.
I did it buying a scrap 16v escort, sump, pick up pipe, inlet/outlet manifolds,down pipes, wiring. Flywheel
Then you need to find a decent mondeo 1.8 16v lump-buy car-cheap enough, swap all the bits from the escort block over to the mondeo one, drop some 2litre mondeo cams in, heypresto you're away.
If you change the mondeo flywheel-well you must change the flywheel to the escort one it will mate perfectly up the ib5 in the ka, stick the started motor in and its done-apart from all the fidily bits.