Chris,
I just scanned this page from an old QBP wholesale catalog:
http://www.flickr.com/
The data and illustrations at the lower right portion of the page should answer your questions about the cog lettering and their placements on the 7-speed freewheel bodies.
Freewheels have become increasingly rare components, so this info had been omitted from their more recent catalogs. You may want to download the larger sized image for future reference.
Yep, this is why I save my old catalogs.
Cheers!
BOB HANSON, ALBUQUERQUE, NEW MEXICO, USA