A couple of things. Energy cell wise either way will work. Now what is more important if this is 57 model it should have the late cylinder head. The intake valves should have from 0.00 to 0.015 recession. I never seen that were correct from the factory. Then have the stem height of the exhaust valves match the stem height of the intake valves. I am more interest in your 1950 model. 88. does it have the hourmeter mounted in the sheet metal? does it have a PSB model Z  pump. Give me a reply. What is the serial number and did it have Hydra-lectic when the tractor was new?