I usually wait for the machine shop to tell me what they need to bore to before I buy the new piston and rings and rod.
Not too tough to put it back together just follow the manual very carefully. Shimming the camshaft and the bearing plate are the two things that require you to use trial and error, take your time and don't be afraid to take it apart and try again. If you don't have feeler gauges, you'll need a set.
Seating the crankshaft oil seals is another that you need to read the instructions carefully.
Be sure the oil hole in the connecting rod at the crankshaft bearing is facing the correct way (toward the camshaft IIRC). Make sure the oil dipper doesn't hit the oil pan. I've had to trim them before on a K241 with a flat oil pan.
All of this is explained in the manual. Take your time and it'll be a great learning experience.
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