Looks like she's been froze, more than once. With any real luck, it may not be totally cracked, but that manifold will need to be replaced. I'd start with a cooling system pressure check, compression, and leakdown tests. I have a 120 and a 140, both were froze but survived by just blowing out the core plugs, got them cheap and are good runners. The 120 gets slightly milky when just idling slowly watching the scenery, but a good ten minute run at wot she clears up. It could be a leak, but passes all my above mentioned tests. I think its condensation from running cool lake superior water, thought about switching from the 140 deg thermostat, but am reluctant to do that.