carl---
Welcome--
It's really up to you how far and how detailed you want to get with your engine. All of them will run just like they are. THe difference is in how long they will stay running if detailed completely.
AT THE LEAST-- Remove the head, cylinder and piston and camshaft. Grit and grinding residue is commonly found inside the right cam bushing and in the bottom of the piston/wristpin area.
The top bearing shell will tell you if the engine has a lot of grit or not. Scrape any grit out of the shell with a razor blade and reinstall, if it does.
Don't assume ANYthing about the engine is 'right'. If there were a way to install the piston upside down I'm sure the Indians would get at least half of them wrong.
Understand cam/valve and fuel pump timing and bleeding of the fuel system. Those things, more than any other, determine if the engine cranks on the first try or not. That means if it doesn't fire and run on the first try the probability is about 9 to 1 timing or air bubbles are the cause.
Since I have one of the early 'jumpers', I highly suggest the engine be bolted down before starting it. My second engine is smooth as silk....the first one wanted to go to China to get the silk.