building and installing world on two separate machines

[Dave]

Hello,
    I have a machine that i want to upgrade from 5.x to 6.1. I've got a 6.1 
world built on a much faster system and would like to just install it on 
this machine. I thought about nfs, but i have to drop to single user mode to 
do the make installworld and won't have nfs available. Is there a way i can 
install this already compiled world on the slower box without having to 
remake it?
Thanks.
Dave.