Thanks all,
I'll let you know if I have any issues.
I'm planning to build them with what I think are Dura Ace 7400s (also from ebay -- used see pix below), auction said for 6-speed freewheel, can I assume they will be 126, it didn't mention ... I know I could always fit in my steel frame if 130, but not likely 135

.
Thanks again!
from description ...
Beautiful set of 36 hole shimano dura ace hub for a 6 speed freewheel. These have seen very limited use.
If your looking for some for your vintage bike or to have a spare set of wheels for it. These are it!
Very smooth and clean