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Thank you for those links. Very informative! Not sure I've got the answer though!
I have a mid 90's cartridge bottom bracket that's 111mm that looks like this in my bike cave:
I'll give that a go, and see how that goes. I've got a feeling the chainline will still be too far out though. If that doesn't work, a 109mm Pista BB might have to be purchased (if I can even find one at a reasonable price!), but I've got a feeling that even if that works, I may have to clearance the RHS chainstay slightly (using the hammer/broom handle technique) to prevent the chainring fixing nuts from fouling.
Rhodrich-
The original BB being asymmetric does complicate things.
The DS was 30mm, so in theory a symmetrical BB would be 114mm for a 43.5mm chainline (between the chainrings).
So 111mm should be close if you were to put the ring on the inside: is that possible with these cranks?
If you do need 109mm then I think Victory or Triomphe also used that, although they aren't much easier to find than Pista.
I'd be tempted to use a 107mm UN55.
Scilly.Suffolk
"you do the math" seems appropriate at this point :)
http://www.bikeforums.net/classic-vintage/974793-question-about-campy-bb-spindle-lengths.html
http://www.minortriad.com/campagbb.html