Fastening Steel Stud Track to Concrete Basement Floor
will work nicely to hold down your new plate. I have been a carpenter for 35 years and if you want a moisture barrier between your bottom plate... metal or wood you can cut a piece of felt paper to fit under the plate. Actually you cannot even use galvanized anchors of any kind with the new treated. The galvanized metal track will be okay as it will outlast the rest of the metal track that is already there. Make it easy on yourself. hold your drywall 1/2" off the floor to avoid the drywall getting damp . Good luck !