[SeaSlugs]

So heres a question and situation:

Situation is I got my AA frame running beautifully (video to come) since I replaced all bearings in the trans (no more thudding/clacking) and cleaned up the teeth. No weird noises and smooth as warm butter driving it.
I also while it was down I installed an oversize throttle shaft due to some wear on mine and couldnt get it to idle the nice model a pakita packita packita and flushed the block and radiator out so it doesnt overheat anymore.

Now I start on the body work and finding some ever critical parts so the frame sits. I just put pure water in it for testing purposes (much easier to dump out if I had another problem).

I plan to drain all water out so no fear of freezing.

But here is the question:

Should I leave it bone empty till next spring?

OR

Should I fill with 50/50 antifreeze?

I have been advised to fill with antifreeze (green stuff) even if the engine just sits - cant rust that way.

Also a side question : any tricks to get the dang ford repo hose clamps to seal?