Could sort you the whole head out if it's needed. Not using it as there are cracks around the plug holes.
I don't know the answers to your other questions
I will have some rockers available when my replacement head turns up. Can get you some pics if you want. Can't recall the condition. As uve not looked at it for ages
It's not a slabby. But I'm just not sure what turbo to use with the engine spec. And every manifold I find/buy I have clearance issues. The above pic is a tdo4 something! Don't really want to cut the frame!!! Well any more