Il share the knolage and experience i have to date,
From the conversations iv been recently having with Keith Davison who is a well respected race engine builder in Victoria.....the engine (ca) I'm getting done at the moment, he is going to clean up the ports (casting marks and bumps) and has mentioned there is a lot of room for improvement around the spark plug area and in the combustion chamber area.
Il be getting the manifolds match ported and a casting marks cleaned up then up the boost for more hp :)))
For someone who knows there trade it's quite apparent where is restrictive and what will (has) work. The more money (with the right contacts) you have to reach the hp goal you must start with.

Taking all these things into account hp/boost/kw and the budget
Will be the starting point. If anyone who is serious about getting a motor built (not just talk about it) and would like Keith's number then hit me up! It's all about who you know