Don't waste your time with a 1.8. Just stick with either the CVH or build a 2L Zetec. The rods should be fine from your ZVH. The pistons probably won't be as the 16v head has a smaller combustion chamber meaning that the compression ratio will go up dramatically. You'll probably need some pistons to suit which means having the block checked and machined if required.

The GT28RS will depend on what housing you have on the rear (3 bolt flange or T3 type flange). The T3 flange will bolt straight on and will just need a down pipe makingand suitable oil return/feed pipes. You will be pushing a standard CVH (and Zetec) set of rods over the limit if you run big boost on a GT28RS though so think about replacing them with a set of Farndon rods or similar if you start going above 250bhp.