Based on what your photos show, I would not "run it". The "pinned set screw gear" set up in first photo is not good. Lots of wear on gear cover plate by the gears. Time for a new oil pump, in my opinion. Also, be sure to check the oil pump drive gear located at the rear of the engine.
https://www.quartoknows.com/blog/qua...cting-oil-pump
Read thru all the oil pump related links here.
https://www.google.com/search?q=worn...hrome&ie=UTF-8