Before starting the actual assembly, I needed to clean the parts one more time. To get to the oil passages, I first had to remove the small core plugs from the front of the block. The book by Tom Monroe suggests that you drill a small hole to the plug, install a small screw in it and use it to pull the plug out. Unfortunately this only ripped the face of the plug apart. In the end I had to drill the whole plug out.
I spent a few hours going through all the oil passages with brake cleaner and WD-40 and a small brush from a gun cleaning kit. There was a surprising amount of dirt in there but I got them spotless. Then I went through the cylinders and insides of the block one more time.
Finally I installed new plugs to the block and was ready to start putting the engine back together.
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