Hi,
Take a look at the graphic enclosed in the link - http://virtualpicasso.wordpress.com/2013/06/17/vsphere-ha-clustering-best-practices-nice-and-simple-does-it/
is taken from HA best practices so you'll be fine with 2 nic's. Key is specify the active nic for each port group to be the alternative to the other port group eg
vmnic0 be the active for mgmt and vmnic1 for vmotion and opposite standby's.
Many tx