Just a couple of things that come to mind;
Make sure that you have a
clean work area and that you keep everything
clean and organized. Is the machine shop going to clean the block for you? If not you will have to
clean it yourself before you start. And, using a tap, clean out all the threaded holes in the block.
Use an engine stand if you can.
Get a gallon bucket and put a couple of quarts of 30 weight in it. Dip all your moving parts in it before assembly.
Did you get your replacement cam yet? Remember, you will have to set the camshaft end play;
http://www.onlycubcadets.net/forum/s...317#post388317
Take your time and be careful installing your new rings. You don’t want to deform or break them. You might find it helpful to use ring expanders;
https://www.amazon.com/dp/B0009OMYC4...V170RD6O&psc=0
Clean up your timing marks and highlight them with a white or yellow paint pen. And remember, you can set the timing using the static method while the engine is on the stand or workbench. You might find this easier than after it's installed in the tractor;
http://www.onlycubcadets.net/forum/s...080#post276080
If you have a dial indicator, it is a good way to set the piston at TDC when you adjust the valve - tappet cold clearance;
http://www.onlycubcadets.net/forum/s...227#post338227
While you’re waiting on the machine shop, you can plane the head;
http://www.mgonitzke.net/cubcadet/tools/headgasket.pdf
https://www.youtube.com/watch?v=L1jF...ature=youtu.be
And rebuild the carb';
http://www.mgonitzke.net/cubcadet/to...rb_rebuild.pdf
Get a couple of quarts of Brad Penn break in oil;
https://www.amazon.com/dp/B002RF8IN2...V170RD6O&psc=1
Follow
Merks advise for breaking in your freshly rebuild motor;
http://www.onlycubcadets.net/forum/s...0&postcount=19
Don’t rush it. Anything worth doing is worth doing twice if that what it takes to get it right.