From the CCM's perspective, the 1760 would behave as a single H.323 gateway only. However, if your intention is to have select numbers for a set of
fxo ports, create one route-pattern for each set of fxo port and configure the dial-peers in the 1760 appropriately to handle this.
Another option is to use DNS. Have 8 DNS entries for the same 1760 and use the above mentioned dial-peer configurations. CCM 3.1(3a) that you have is fine for the above solutions.