If your going to spend the time/energy to drop the tank to replace the float, why not replace the entire fuel pump assembly.. With murphy's law, when the pump does go, you will have a full tank and be nowhere near home.. Might as well change the pump on your terms, when you want to, instead of letting it dictate when to change it.
You should check to make sure that it is the float that is causing the issue. If I remember correctly, you can ground the sending unit wire near the tank and it should make your fuel gauge read full. If it doesn't you have a bad wire or a bad cluster or gauge instead of a problem in the tank.
~Mark