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my 360 had a bad leak at the rear of the engine. I pulled the trans and flywheel. I found 2 big cracks on the back of the motor next to the freeze plug. I can weld cast,but should I even try. I dont want to get another block.
Welding the block isn't the problem. Getting the oil passage sealed up is going to be a problem. If you're going to try and save the block, tear it down first and see if there's any possibility that the oil passage can be sleeved or sealed.
As common as 360/390 blocks are, I think you'd be better off getting another block. And a 390 crank and rods... :-)