I have a 1955 year model super 66. I am planning on adding a hydraulic unit from a 660. Some people have told me about a shaft or gear that runs the mechanical lift that is in the way and will have to be cut out in order to provide room for the pump to sit. Can anyone confirm one way or another or elaborate a little more ?  Others say I won't need to do this on a tractor as late as a super 66. I'd like to know  before I undertake this project.