My raft is constantly exposed to NW winds, including pretty strong wave action at times. Not anything like you'd get on, say, the North side of Rattlesnake though. My block is about 2X2X2, sitting on a sandy bottom in about 8 feet of water and is more than adequate. You really don't need the same amount of weight as a boat since the raft weighs so much less and doesn't produce nearly the same up and down forces on the mooring.
I strongly endorse the idea of running a piece of maybe 3 inch PVC through your mold to give you something to feed the chain through, as opposed to using an eye-bolt. The latter, unless very over-sized and stainless, will rust away over the years leaving you a rather useless block of concrete on the bottom of the lake eventually. Prior owners did the latter and I will soon (this year?) need to replace the block.
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