With core 3 I have used apt-get to install alsa but there appears to be no alsaconf????
As far as I know, fedora core 2 and fedora core 3 use the 2.6 kernel. In the 2.6 kernel, alsa is compiled inside the kernel. You don't install it any more. DO you have problem with the sound? Try alsamixer to see if the volumes are muted, or use another mixer, in your GUI (probably gnome)