You may not need to do anything with alsa other than re-initialize it. It should automatically access the new modules.
Scratch that. You do need to reconfigure alsa because it configures with a specific kernel. You probably don't need the newest alsa release candidate though.
I would just
$ rpm -e --nodeps alsa-lib $ rpm -e --nodeps alsa-utils
to remove alsa. Then, immediately after (don't reboot since you used --nodeps)
$ yum install alsa-lib $ yum install alsa-utils
Then try the /sbin/service alsasound stop/start to remove and reinstall the modules.