Storing engine in unheated garage

Looked at other threads, this wasn't addressed. I got my 340 out of the car, will be storing it in a unheated garage on a stand. Cars normally stored in a heated garage so antifreeze is just protected to a little under 0F. It will get much colder that that here. Sounds like best way to drain fluid is punch out a freeze plug. Do I need to knock out them all, or is one on each side sufficient?