Adding ballast or something like it?

[scottorious]

I have a cal 34. The later model cal 34 shows that it has 900 pounds more ballast in the same hull design. Not that I want to add 900 pounds but would adding anything (integral water tank, batteries, chain storage) be wise? The bilge on my boat is just massive. So moving the heavy stuff down there would be nice. Anybody advise against it? Or adding a some weight in the form of a half lead teardrop onto both sides of the keel. Maybe just 100 pounds per side at the bottom of the keel. Has that been done? Could it just be Encapsulated in fiberglass and epoxy and fiberglassed to the boat?