Drain the antifreeze?

So the 383 engine for my 70' Barracuda is sitting on an engine stand and has been there for at least 3 years. I've sprayed Kroil into the spark plug holes and turn it over by hand once or twice a year. Should I drain the radiator and the block? It's in NY, so it gets pretty cold in the winter and I'm not sure when I'm actually going to find time to work on it. Any other things I should be doing? I'm sure the dual carbs are probably gummed up by now.
Author: JoeNY