Thanks BT. The manual I have is a bit older than '79, so I'm glad you knew where to find one.I believe one of these manuals may get you close enough to help you out with a starting point.
You will need to join up with 4shared, And the other one also, But they are free to join, And they don't bug you with junk mail that I know of.
Throttle and Shift controls for all. 90-814705R03
The Password for the file is <<ribforum>>
From what I can tell from your serial number your engine was made in 1979?