Only "special tools" you need is a valve spring compressor. You can probably to it without out it, but it's easier with. Probably need a 3 jaw puller. No need for a cylinder hone. Probably ought you at least have access to a dial indicator so you can check crank end play, it has a spec.
Tear it all down, and take the crank and block to a machine shop. They will measure the bore and tell you what size piston you need. They will grind the crank and tell you what rod you need.
THEN you order the kit. Not before, but after you find you what size of piston and rod you need. Crank bearings can be re-used as long as they are not damaged. Valve guides are seldom wore out. Let the machine shop bore the block and fit the new piston, grind the crank, and grind the valve seats and install the new valves. Then you do the rest. Do not hone the cylinder and try to do all above work yourself. That's what machine shops are for. Steel points plunger is unnecessary IMHO, governor gear.... your choice. If they look OK, I use them over. Some people swear by replacement only. There are no "add on's" that I can think of you need. Download the service manual and good luck.
