Use just enough chain to allow you to have some separation between the blocks to increase the surface contact and to come far enough away to prevent chafe. Use a swivel as a connector between the chain and the rode with length 1.5 times the depth. The more chain you use the more weight you will have and therefore the bigger mooring ball to support it.
Farris metals don't last long in the lake due to the high acid content; I suggest you use S/S components. With common steel chain and hardware you'll be revisiting this problem in five years.
A thousand lbs. of granite will easily hold a 25' boat.
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