Tom, I see nobody answered you yet. Did you flush it out yet?
I simply jacked the rear end of the car up, disconnected the large hoses at the root end/radiator and let the water run out. I actually also connected my shopvac to them and sucked every last bit of water out. My intake manifold has a bolt on top of one of the water jackets which aids in letting all of the air out. Simply fill through the overflow tank until the water starts coming out the manifold. Also, I disconnected the small radiator overflow hose, in order to let water run through the radiator easily and removing air, until water comes out of this overflow. Once filled, I started the engine to let the air escape and added prestone until I had the bottom of the overflow tank filled. Messy job, but easy enough.
I'm running prestone and water. You could put Evans in it, but it's expensive.