Depends. If you use udev then a udev rule will do the trick
Code:
KERNEL="eth*", SYSFS{address}="NIC MAC Address", NAME="eth0"
KERNEL="eth*"
Should do it (I think) although note that this will make all other net interfaces disappear and therefore may surprise you in the future should you ever add another network card.
As another option add a line "alias eth1394 none" to /etc/modprobe.conf which will prevent the firewire network module from loading in the first place.