Hey guys, from what I have seen so far amazing site and info here. I'm an Electronics tech for the us navy, worked as a licenced machanic before I joined. Worked up several SBC's in my short time here, but never realy came across a big block in that time, looking to up the game on my current project, a 67' cuttlass 442. Not done much work on big blocks, How are the gen VI blocks? I'v seen a lot of negitivity about mark 5's and that the gen 6 is better but other then that not a lot. I picked up a gen 6 block for 400 and don't realy know where to go next as far as internals and heads go, some suggestions would be greatly appreciated... planning on a twin screw sc on top...