I found an old big 40 for sale it runs good and welds good but the engine block is cracked.It leaks coolant both into the oil and outside of the block.You can see where the crack is because someone tried to JB weld it.The motor is a 165F continental.My question is if anyone knows where I can get a block or another complete motor? I would prefer used.I think machine is a 1970 but I am not sure.