If you carefully remove the old push rod guides you can reuse them, if not the PN is 691343. This is for one each guide. These are fairly expensive little chucks of plastic; just my opinion about plastic.
I would use the new parts provided including the metal plate. No point of having to do the work over when you got the new parts. The head gaskets will self destruct upon removal.
Valve clearance is .004" - .006" for both valves since this is the vertical engine. The horizontal version does have a different exhaust valve gap setting. Jam nut should be torqued to 75 - 95 in lbs.
When setting clearances put the piston at 1/4" pass TDC of compression stroke. This is measured thru the spark plug hole using a dowel or similar item where you can mark the TDC position and 1/4" pass on the measuring item. Now of course you can convert these the metric measurements if needed.
You may wonder why 1/4" pass TDC, it is to prevent the inference caused by the decompression release on the cam at or just before TDC compression stroke which is to make starting easier.
Valve lapping should be the same. This is optional but you should use your own judgement on this as you are physically checking the condition of these on site.
