Yea, at the very least a hone and new piston. lots of wear on that thing.  Also, go with OEM rod.  Actually, i have a question for one of the builders;  Being that the Zilla has a bad rod angle, would it help to install a CR500 rod?  I've talk to some Zilla owners about this and they were blown away that installing the CR500 rod wasn't a must do in the HQ community.  Thoughts?