When you rip it apart, try to take time to document the different gaps and play you find in bushings and bearings, guides, gears and the like. To and fro, up and down and in between. Usually everything is ripped apart, put in boxes and then the restoration starts at home and/or sent away somewhere. And every surface is fiddled with. 

Take a lot of pictures from every angle and stage in the disassembly, it does feel stupid and overambitious at the moment, but it is the picture or written note that you didn't take, that is needed later on. The notes will become valuable once to decide what is needed to restore, secondly to compare with the restored details and later as a control base to know what's and perhaps why a detail is worn out of specs. Taking measures is a excellent way to learn the details of the engine.  

I reused "patina head bolts" (rusty) and cracked a pair of nice 37ci cylinders, both front and rear. One bolt hole in each cylinder, right through from cylinder surface straight out. I suspect the cause was that the bolts didn't end up in the same hole and the "bloom of rust", either on the bolt or in the hole at the last threads cracked them. 

I still kick myself of how stupid I was for not using new bolts and not clean up the holes with a tap before.