Seeing as our ports and bolt pattern are reversible, top or bottom mount is doable with the same manifold, provided the turbo clears the hood and steering shaft. On a RevHard copy (what that is), it clears both. There's a small gap between the turbo and master cylinder that needs addressing (shielding), and the ports need to be enlarged and smoothed out. Other than that.. cast iron can't go wrong. Well.. it spits out bolts like children at a Watermelon Festival.. but other than that...
-JEff