Thanks for the reply!
I bought the block from summit already clearanced for a stroker crank. I swear I triple checked all of my fasteners but I guess you never know if you missed something. I thought to check the flexplate also but haven't yet. The pan should be a real PITA to pull in vehicle! It is a really hard knock and almost feels like something is hitting the inside of the manifold. This engine has the poppet injectors that are all concealed inside the manifold... I was thinking that maybe the #8cyl. poppet popped out and compression is banging it into the manifold? I'm so lost I was just trying to think of anything else it could be other than a rod bearing. The weird thing is that it does not make the noise directly related to RPM. It does kinda have a pattern but if you gas it it doesn't seem to be based RPM solely.