But anyways...
...you forgot to mention one of the biggest differences between 1million and 5million series b16's. The 1mil b16's had shorter gearing and allows for better acceleration but, was never opted with LSD.
The 5mil engines had taller gearing and allowed for higher top speeds and had the LSD option. This is what I had in my old 'Teg (including LSD) which allowed me to top 155+MPH...of course, my engine redlined at 10,000RPM's...