20 HP courage kohler SV600s engine

My son gave me his White Outdoor riding mower to fix. The short block was cracked and was leaking excessive amounts of oil. He bought a replacement short block and I transferred the internal parts. One problem is that there are timing marks on the two plastic gears under the cover. I am not sure which ones I should use. They are marked in and ex.

The linkage for the carburetor was off the mower when I got it. Does anyone have a picture of the proper connections? The carburetor end is fine it is the box that is attached to the cover next to the oil filter.

Thanks