DJ
I use two 6S 5000 mah packs for my 160s. You can also use 10S, but I like the extra power from the 12S. If you go with 110s they you can use a 9S setup (one 4S and one 5S pack in series). I think twin 110s would be plenty for this plane. My little DO-335 (66" wing span) flew great with twin power 32 motors front and rear using two 4S packs. I really think two 160s is too much, but if you can fit the batteries inside then great it will haul *****. The problem will be finding two nice props to use. They don't make cheap three blade props larger than 16-10. The 16-10s are too small for the Power 160 and you will loose too much power. The twin 110s may work fine with the 16-10s. I had this setup on my Me-110 and it was great. You will have to go with 18-12 or 19-12 two blades for the 160s. I have had good performance with the Zippy packs from Hobby People. You can get the 6S 5800 packs for around $80 each. Not bad !!!
Just don't push them too hard and they will last a long time
Good luck!
Jeff
Jeff