I have one of these. The 1800 is essentially the same block as the US 1900. Mine is fitted with a zetec fiesta sump like a ZVH, tho I think the 1600 CVH sump will also bolt on.

However you will need to get hold of some proper pistons if you are going to turbo it, the 1800 CVH ones are VERY weak and wont handle any abuse. The 1800 is also 88 mm stroke so you get plently of torque (I got 241 lb/ft at 1 bar boost) but like a ZVH it wont rev as well as a 1600.

Good luck

Stu