Re: 1957 evinrude 35hp lark
CoolGuy...... Yep, I'm sure. Been/was in this line of work since 1960/1991 and followed every update by OMC, seminars, bulletins, factory reps advice, etc etc like it was gospel, and was personally aquainted with Lou Eppel who was the head man of OMC's mechanical department. If the powerhead's moving components (main bearings, connecting rod to crankshaft bearings, wrist pin bearings) are "all" needle, roller, or ball type bearings, those engine could safely use the 50/1 mixture.
I personally followed this rule and have never encountered a failure due to a lack of lubrication.