I had to have a flywheel welded on my 1929 Fairmont Railroad engine. It was a castiron flywheel that cracked at the locating keyway. I had a local high tech welding shop do it. They could only braze it due to the poor quility of castiron. I would bet your block is of equal poor quality.
It may seem like a lot of work, but you might want to JB Weld those pieces back in and pressure check the rest of the block. Plus like the above post suggested, check the cylinder walls in that same area. If it all checks fine, remove the broken parts and sandblast the area before heading to the repair shop. You wouldn't want to speed a lot of money for a repair, just to fine it broke on the other side! Joe
