No worries mate, i stripped an engine at 110k and it still had the original hone marks lol they are ridiculously reliable. weak point being the head gasket. However ford released a new metal layered head gasket for the 2.0 16v scorpio which will fit perfectly on the 8v, this is a common uprated replacement. So if your ever goes i suggest one of those.

Do a google for sierra fsoc, its the sierra owners club, i am a member and they are all very helpful, there are several sections devoted to twin cam engines and one specifically for kit cars using the dohc. Most of the people on there are very knowledgeable and help full so give it a go. Ashley also supply a 4branch manifold for your engine.

Rob,