OH yes I get that. But I made the mistake of leaving water in the block in a heated garage. But I could not believe how fast my water pump and coolant passages accumulated rust. Antifreeze is not just for freezing protection. If the car is going to sit for a period of time I will always add antifreeze for rust and freeze protection. In my current build I am going to take the time to add some provisions to make it very easy to drain the block. This will be handy for between rounds draining if necessary and easy seasonal maintenance.
Just my 2 cents. Nice motor by the way.
Duane