I recently installed a mini-truck power steering box with with OEM style pump from City Racer on my 1983 2F. I also purchased a reproduction oil cooler from Classic Tube. During the install, my shop advised that because the low-pressure hose size is 3/8, and the cooler diameter is 5/16, it shouldn't be installed so as not to restrict flow. Have any of you heard of this concern before, or is a cooler even necessary?