with the new merge thing you are making, would it be possible to daisy chain a 300w hdplex ac-dc and a 160?
Yeah it would. That being said you don't actually need to merge to use those two with my system.
Ordered my dynamo 360. So with this unit, the 160 and a Dell 330w power brick, I should be good to power my 1080ti, 1600x and Asrock b350? Just making sure I am good when the case and 360 show up.
By the 160 I presume you mean the Dynamo Mini/HDPlex 160W DC-ATX? If so then yes you should be able to run those. The Dell brick MIGHT be a bit tight on the wattage with a 1080 Ti, but if that is the case you should be able to run the 330 with the 360 and add a second power AC-DC unit (160W AC-DC internal if you're building in the S4M) and have close to 500W. Which case you building in?