Forgot to mention the block is .030 at 4.16. Probably could go .060 even. The crack could be fixed but it's expensive. Welding cast iron is a art that only a few places here in the states do well. But I'd have someone look at it. Sounds like when the rod left the building it took the block along for the ride. It could have been the capscrew was used a few to many times. They are a tri-lobe design and will fail when reused a few to many times. ARP makes new ones but the rods need to be tapped for them to work as intended. That might explain the one lone C7-B rod maybe???

G.