Hi Eric,
My bike (manufactured late '61) had a mixture of both, courtesy of DPO I guess - the studs weren't consistent either..
I'm not saying mine is necessarily right but I've fitted sleeve nuts to mine as I thought that was correct, they also are much easier as there's very little room for dealing with standard ones... I also fitted new studs just to be certain I could tighten everything down evenly.
Hope this helps...
Adrian