I rebuilt an FD611v which is the follow-on engine to the FD590v and shares many parts in common. I purchased the bulk of my parts from Pete's individually, not as a kit, however. From my research, all the internals, the block, almost everything is the same. The differences with the JD spec'd Kawasaki's are carbs and cranks. Oh, and the price.
BTW - I think Pete's is great, shipping can be a little slow but the price is right.
BTW - I think Pete's is great, shipping can be a little slow but the price is right.