Larry I didn't know there were W30s w/o concrete ballast. But I'm quite sure all those w 3.5' draft do. There are access ports in the Laz and the concrete is right below the engine. If you want to make sure you could scrape it w a tool and see how it feels and sounds but I think they are all concrete except the boat Kieth got and probably the "8 Ton" sailboat. Prior to survey just count on it and during the survey rely on your surveyor.
In the W30 line they didn't switch to lead ballast. And the thing that made the jack hammering an "ordeal" is the fact that one needs to do it down in a hole. There is a book on Willard boats .. Of sorts. See the yahoo groups and find "Willard Boat Owners" (WBO) group and read hundreds and hundreds of posts on Willard boats. Everything is in there. Windows, engines, anchors, rudders, steering, water tanks, fuel tanks ......... everything that has been done or thought about on the W30s is in there .. well almost. It's all 100% Willard. The windows on W30s are plexiglass or Lexan ... How to deal w them is there.
Getting a really good surveyor and my post #7 should do much to keep you from the "money pit" other than "it's a boat" part. And you could possibly do well buying a cheap boat that isn't very presentable but has good basic things like a newer engine, fuel tanks, stable ballast ect. The big advantage of re-fitting a boat is that most important things are the way you like. I got to choose my engine, gear, fuel tank material, electronics, stove, anchors, batteries ect ect. But buying a boat that another or others have put lots of money into gets you the best buy.
And avoid the urge to buy the first boat you find. There are always Willard's for sale. Until you buy your'e in the drivers seat and have control. It can be a fun experience. Looking at boats is hard to beat.