Can you put a clawfoot faucet into a regular fiberglass tub.
Depends on the style of faucet and tub. Clawfoot tub faucets either go over the top of the tub lip or through the side of the tub. If your faucet style goes over the top, then all you need for it to work with another tub style is to make sure that the faucet is long enough to pour in to the tub without splashing on the tub edge. If the faucet goes through the tub side, then you need to check that the faucet hardware is long enough to thread through the new tub sides and that the tub is deep enough to have a faucet mounted below it's rim.
For general message board help, click the tab labeled "Tools," and choose "Help" from the dropdown menu.