Probably the best way would be to keep it in some sort of heated enclosure. Not sure if anyone makes a heater that will go into one of the freeze out plugs. I had a diesel out of a 1772 that had a heater in the lower radiator hose but the radiator on those is at the front, red arrow pointing to the heater in the pic of it when I had it on my work bench below. As far as the hydro maybe one of those dip stick heaters?
