I'm looking for an as efficient rear end as I can find. I know Ford ' lose more HP than most, and that a GM 7.5" 10 bolt is better than a 12 bolt. I would assume that a Halibrand V8 QC would be better than the Champ. How about the Frankland- is it like the V8, or the Champ? Overall, which rear end loses/robs less horsepower?