You need to Switch the IP L3 links which are terminnating in the 6500 to use the FSWM instead of the Sup L3 router.
If you have the ports on the 6500 configured as L3 ports you will need to change then to L2 Vlans. Then attache the FSWM to the vlans then you can bring up the corresponding L3 Vlan interface on the FWSM.
If you run the FSWM in single context then you can still use OSPF.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...