1) Connect ASA-1 to N7k-1 and ASA-2 to N7K2(configure a trunk port to carry inside, outside & Other vlans as required)
2) It is best practice to keep the interface which is connecting to ASA as orphan port.
3) Create a trunk between N7K-1 & N7K-2 allowing all the required vlan(inside, outside Ect)
4) Assuming that you have a pair of wan routers to connect outside, Connect the WAN routers to the "outside" vlan in both N7K1 & N7K2, and run HSRP in both WAN routers for "Outside" zone/vlan.
5) Add a static/default route from ASA to HSRP ip of wan router.
6) Add route towards inside zones in WAN routers towards the "Inside" virtual ip of ASA.
Hope this helps.