This can been done via the agent policy, you need to change the repository section the the required mcafee sites and then disable your epo repository.
If you are using ePO 4.5(management), login to server | menu | software | distrubuted repositories. If all repos are removed it would automitcally leave the mcafee ones there.
Alternatively in your system tree, change the Mcafee agent policy repositories to only use the mcafee ones
Thanks to everyone who replied with the correct location for configuring the agent as desired. This issue has been resolved.