Bob,
Some thing is wrong today with my ability to access to the CJ-3B B.B.
Here's the dimensions you need.
Center of rear tank strap capture nut is 5/8" inboard of the wheelhouse and 5/8" back from the edge of the floor rise.
Center of the front tank strap capture nut is 10-1/2" inboard of the quarter panel and about 19-5/8" from the floor riser.
By the way that body is looking very nice. I'd really like to have an identical 3A tub.