Definitely pull the pan and aim the nozzles at the dippers. Above idle speed the rods get lubed by a stream of oil squirted straight across the pan by the same nozzle that fills the trough for idle lubrication. Attach a water hose to the supply tube and see where the water hits the pan on the opposite side. Some guys scribe an "X" on the far side of the pan from the nozzle and aim the squirters to hit dead center. It's a lot simpler than trying to use the factory alignment fixture.
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!