I have a 72 Ford F100 with a 360 V8. I pulled it out of the woods a while back after sitting for 13 years and have been tinkering with it. It is not currently running. Temperatures where I live are going to be below freezing next week, and I have no idea what ratio of antifreeze/water is in the block currently or if there’s anything at all.

My current plan is drain most of what’s inside by pulling the lower radiator hose then pulling the thermostat so I can pour antifreeze directly into the engine through the upper radiator hose. Would this be effective in protecting the block from freezing or is there more I should do? The truck will turn over, but I can’t get it to start (carburetor needs to be rebuilt). I appreciate any advice you folks have