Roger,
I ran the car up on the lift and snapped two pics of the CVs.
The first is of the diff side; the second the wheel side.
I am not sure what the original source of these particular CVs are -- I seem to remember Tom telling me that this design spec had seen duty on Can Am cars. Tom told me this when I asked whether they could stand up to 600 H.P. That was his way of saying YES.
The inboard mounting yoke is slightly different than the vintage piece, but it slips on to the splines of the stub axles just the same. While I didn't actually weigh the axles for comparison, I would say the the CVs felt considerably lighter.
I've got about 2500 miles on them with no problems.