Whisenhut/Dolphin Reels makes aftermarket motors for Penn Internationals and Senators that still allow anglers to use their reels' handles when desired. BTW, a Penn International 80W should hold a LOT more than 1300 yds.of 50 lb. line, especially if you're using superbraid - which you should be using for deep dropping due to its small diameter and lack of stretch. I have a bit over 2000 yds. of 130 lb. P-Line Spectra on an International 80 STW.
http://www.dolphinelectreel.com/