Well, it turns out that I have 5 different copies of the same manual - 15-91 Adjuster's Manual with 3 different file sizes. I think that might be a hint it's time to clean up a little!
Donna, have you checked the timing on the White? Assuming it's the same set up as the White Rotary I just worked on, needle flat to the right too? Does that one turn the handwheel clockwise (opposite of a Singer) to operate? The easiest way to tell that - assuming that the machine hasn't been really messed with is to what the "four motion feed" of the dogs. It should feed backwards when they're at the top. The white rotary would feed forward if I turned the handwheel forward (counter clockwise). Those are the 3 major ones I ran into timing-wise working on a white this week. Others were needlebar too low and needle striking the hook intermittently.