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Miles-
Don't give up on your broken block. It might be able to be repaired with a powder torch. I had the exhaust spigot and a broken fin repaired on my 1912 Pope head. It is cast iron. A powder torch is like a welding torch with a reservoir of cast iron dust. The cast iron comes out and fills in the area that is missing or broken. I've tried to attach a picture of the head. If it worked you can see the whole left half of the exhaust spigot was missing. And the fin on the front right was also missing. It came out great. And after a few heat cycles you won't be able to tell it was repaired. Metal stitching is also an option. I had a Pierce Arrow at one time with a cracked head. I had Frank Casey in Massachusetts repair the 8" long crack with metal stitches. A great repair and the car is still running around today with no problems.
Darryl.