The Fiesta inlet won't fit the head no, you need an 1800cc Zetec inlet. Only the injectors are side fed so the Fiesta ones don't fit without making your own fuel rail.

Exhaust manifold - buy a Zetec to CVH adaptor plate so you can keep the one you were using before. Don't drill and tap the head - it's abad idea from my experience.

Also you will need to change to a Zetec water pump set up, and if there are any holes in the block from the CVH water pump that's fitted now then they need to be blocked off otherwise they will leak coolant.