FWIW, Jegs' website lists the weight of the QT bellhousing as follows:
6056 17 lbs
6057 23 lbs
Also, FWIW, in a side-by-side comparison before my QT was installed, there was a noticeable weight difference between the Lakewood and QT. One was definitely harder to curl than the other.
And one more thing, from a non-mechanic "write-a-check" perspective, the Lakewood, which I installed on my old Corvette many years ago took forever to dial in. I really mean forever. Frustrating it was.
The QT installation on the Cobra was quick and simple. Saved me much money, notwithstanding BBC's and BBF's are obviously different animals.