Simple enough to do as the blocks the same as a YB cosworth, your best option is to find a dohc 2 litre 4x4 sierra as a donor as everything will bolt on inc gearbox just use a 4x4 YB sump, oil pump and pick up.

Were these available in SA? otherwise a 2.8 can be used but you will need either a 2 litre MT75 box or one from a cosworth.