[CentOS] Update to base release

Hello All, We have some machines running CentOS 4 Update 4 (4.4). We want to update these boxes to the stock CentOS 4 Update 8 (4.8). We have the 4.8 iso images. Is it possible to use up2date and have it use the 4.8 mounted iso images on a remote (install) server as the repository? The ISO's are accessible through http. These servers are remote with no CD/DVD option to upgrade that way. I have tried to Google this but can't seem to quite hit what I need. I found one that shows up2date-config GUI setup but I do not have X running on this server and do not want to screw up the config with the CLI version of it. We need to go to stock versions to match our production RHEL 4.8 machines. Thanks, John