So it has taken me 11 months to change fluids, fuel lines, plugs, new points, etc to run it after over a decade. Fired up like a brand new one! Pulled it back into the shop to start going through things more thoroughly and listing items. Took a valve cover off to get an id on these heads (as mentioned the previous owner informed me these were not original) and what a disappointment I found 333882 stamped on them. From what I've always been told that these make great boat anchors haha. Will keep updating but wanted to add life back to thread since the Z is alive again (or will this be classified as a partial Z for now)