Isn't the WaveLAN Gold the one that is the same inside as an Apple AirPort Card, so you can use the AirPort software and it will see it as one? (I seem to remember that there is a way to install the AirPort software on machines that don't have an AirPort slot, as by default it doesn't allow you to do that)

Nice find by the way, a 3400 would be an awesome machine to have!