The kodachrome is balenced for tungsten lights, if you use outside under sunlight, you will get odd color casts, unless you use a no.85 filter. If you shoot with the filter rate it at 25, without the filter 40. When you open the film could you take a picture of the end, see what the code printed onto it says.
The odd thing about regular 8mm cams is that you run the 25 feet, open the camera up and flip the film over and run it again, a bit like a casette tape. So you actualy get 50 feet out of it, and 50 ft will get you 3 min 42 seconds of running time at 18 fps according to
http://www.kodak.com/US/en/motion/filmCalculator.html
I don't know for sure, but the thing with the red dot and all the half circles may be some kind of film counter. As for automatic or manual, that really depends on the situation, and if your in camera meter is working right.