You are probably better off getting a converted ZVH engine using the turbo (and top end from Mk4) and the bottom end from a Zetec 1.8 or 2.0 engine. I think you can check Burton Power on modifications parts, i.e. mating gasket and oil feed pipe (need to research on that more).
I believe that I seen someone trying to shift a similar engine on eBay/Gumtree for the last few months now in Harrow.