Jon, the factory manual won't make any reference to the drag link being level because the suspension system in its "as manufactured" condition has that relationship built in. If the drag link isn't level, something is wrong with the springs, shackles, steering knuckle, or other parts that affect ride height.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!