You said your 160 head has all the goodies? Stainless valves, 26lbs springs, and trick keepers? None of that will work in the new head. You will need pushrods from the predator. They are longer. You have a tricked out GX160 head. Most people would kill to have your head.
New style predator head is great also but now you have to trick it out with new parts unless you feel good running it stock.