Jeff,
Going to a different type of Pitot tube gets into an area of experimentation.
If a person uses the location of the original design for the pick-up point, that should be a pretty good starting point. See where your original tube puts the open end where it would be installed.
What you are trying to do in locating the Pitot Tube is put the open end in the airstream where it will be minimally affected by flow over/under the wing/struts and off the prop.
Installation advice from the Pitot Tube Manufacture (if it is available) should be considered. There may be other differences than simply location.
Dave S
KF7 Trigear - Flying
912ULS Warp Drive
St Paul, MN