I know there is the main crack, first picture to the left of the red line, sorry for all the lines, the welder wanted to knokow what he was up against. I did a leak down myself, pulled carb and exp chamber, plugged both holes and put a few lbs of pressure where the sparkplug was, worked like a charm.
The others may not be cracks, they just look like them.
I'm guessing the reason the case cracked is because the engine siezed at a high rpm and there could have been a huge jolt cracking it.
As for the bearings and internals, EVERYTHING is new from top to bottom, when we put the engine back in it was blowing tons of oil out the exhaust.
I'm sure the welder is going to do, he fabricates racing chassis for porsches and one that actually won the Lemans.