RE: Cylinder Heads

Enjoying this thread, as I have a project Blazer in the planning/parts gathering phase, with this theme. I would be interested in a follow-up discussion on what is the best cylinder head build-up for 6.2 NA engine. New to diesel/6.2.
(A little bit of experience w/ gas engines)
Why was the "6.2L "C" series cylinder heads" recommended above? Assume this is any "C" engine head? Why not "J" series heads? Assume their are many areas we could discuss,e.g. best valves, valve preparation, seat angles, throat cut angles/depth, head porting tips ( critical areas to work/ areas not to touch), valve lift vs power development ( what lift range effects power most). I am ready to turn on the flow bench and get the grinder cutting!
thanks,
Les