I'm working on the Starliner right now as well. It is hard to mount the shift linkage. There should be a small indentation on the drivers side of the transmission . There is a mounting tab on the linkage itself that kind of fits in that indentation. I recommend scraping off any paint on the mounting surface of both parts before glueing.
What I also learned the hard way is that the two engine blocks and trans. are NOT the same. There's one that has a cylindrical part molded at 90 degrees on the transmission that will get in the way of the shift linkage. Don't use that motor, use the other one with a flatter area where the linkage goes.
I'm not sure what the original kit is like, but the Round 2 2008 release has options for both manual and automatic transmission. The linkage can be seen below: