Correct Oil Pan Identification for '65 273 in Valiant/Barracuda?

I don't see any obvious differences between the "394" and the unmarked 273 oil pan. I guess the clearance notches for the steering link are not the same right and left, one side being more severe because the motor sits offset toward the passenger side as factory installed. Both "notches" look about the same to me.

273 oil pan member photo 1.jpg

oil pan 394 2.JPG