Help needed with sb 318

Well, most of the guys have addressed the dipstick issue but I think on the freeze plugs they ignored the elephant in the room.
If you block has a lot of sediment, it will be very good to flush. I would pull the drain plugs in the block on both sides. These are visible 9/16 hex head in pics two and three. You will likely have to clear sediment to get them to drain properly. You can flush from top to bottom by pulling a heater hose loose and push water from your garden hose. (now on the the bad part)
Other freeze plugs, such as the ones under the motor mounts and at the front of the block, (picture two again), may not be currently leaking. These may be compromised and leaking soon after the initial stuff is flushed from the block. Your choice on taking this to heart. Ditto on the statement #1 from Rat Rod AL.
Take it from the guys who have been there.