The VintageKenmoreSewing group at Yahoo has a manual in their files for a 158.1703, which may or may not be close to your machine. It's described as a super high shank sewing machine. You usually have to join the group to access the files, but it's free.
Here's a source for a download for 158.1701. It costs $5.95. Pay with Paypal.
http://www.kenmoresewingmanuals.com/...manuals_3.html