Good stuff @Steamer, looks like you’ve been through this rodeo a bunch of times. I‘m going to focus on “dry” approaches as the sludge drys out. Good luck with the build and search wrt SS valves.
@Steamer did you use a pressure washer? I have a fair amount of sludge in the deep pockets of the water jacket, trying to figure out the best way to get it in suspension so it can drain out the block drain.
I don’t have any help or knowledge on this, hopefully someone with some will chime in. But I am curious about the water jacket cleaning shown in the above video, especially the clean-out plugs for the cylinders. Have you done this and used those plugs?