The rebuilding company has to guarantee the core after they rebuild it. A cracked main journal is fixable - if it's the last engine in the world. Otherwise not worth it. If there was enough heat to crack a main journal, the crank could have cracks - the reason for dye. A cracked crank can be fixed, again if it's the last one in the world. I wouldn't rebuild a block with those fixes if I had to guarantee it. It could be the block was a little off from new and put some added pressure on the journals. British machining is getting better, but not great. If the basic block was made by Perkins, some of Perkins older engines required hand fitting some parts. I repaired a broken crank for a 1913 Cadillac. It was a huge job, prep, preheating, welding, post cooling, machining, magnafluxing, probably 100 hours. Owner woulda bought a new crank if he could.
I imagine you can have your core back if you pay to gather and ship the pieces.
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