Richard, Perhaps first you should measure the width of the BB shell to verify that it's 68mm, if it has been "overly-faced" you could just use a alloy freewheel/BB spacer.
But, maybe better check the alignment of the rear triangle to make sure both sides are centered - ie: spread the same distances relative to each side of the main tubes. You can probably just use a long straight rod or a broom handle pressed beside the head tube and the seat tube on one side and stopping between the rear dropouts. Take a ruler and measure the distance between that long rod and the dropout. Then do the same thing on the other side of the frame, measuring to the other dropout.
Good Luck!
From: r cielec <teaat4p(AT)yahoo.com> Subject: Re: [CR]Stronglight BB Adj Cup Lock-ring?
" Imagine the crook where the lug for the chain stay branches out of
the trunk of the bb shell. The lug stems-out at a slight angle.
Now, in your mind's eye, Horatio, see your self tightening the lock
ring and as the lock-ring contacts the face of the bb shell, the outer
diameter of the lock-ring is making contact with that branched lug such
that the lock-ring is augering into the lug. Contact is not limited to
the face of the bb shell but additionally against the lug. "