The two bottom bolts on the timing cover are threaded through from inside the crankcase. Lots of people drill and tap for one size larger bolt during the job, so the pan doesn't have to be removed again. If there are two headless bolts at the bottom, yes, you will need to drop thew pan. Check on the condition of the rod and main bearings while you've got the pan off, and clean out the oil pump strainer screen, too!
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!