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Nice! That should work perfectly.
For my setup, Campy 10 shifter plus Exact Actuation derailleur is 2.8mm x 1.3 = 3.64mm. Shimano cassettes have 3.95mm spacing, so that's about 0.3mm "error" between sprockets, or less than 3mm across the whole cassette. It works pretty much flawlessly.
Your setup should be even better. Campy 10 shifter plus old Campy derailleur is 2.8mm x 1.4 = 3.92mm, so it's almost exactly right for a Shimano cassette. Now you've got me thinking!
(I got my numbers here, if it helps: http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/.)
OrkneyDullard-
Useful numbers.
I’m changing it up to get lower gears mainly.
I have a 90s racing triple derailleur, I’m not sure how big a sprocket it will shift on to, I guess I can use one of those mech hanger extender doodads, capacity will be an issue too maybe - I’ll be changing the triple for a ‘sub compact double’ TA cyclotouriste 48/3?
absurdbird
I’m planning on doing something similar with my 90s tourer.
Campag 10 shifter
Old Campag derailleur (pre 2000)
Shimano 10 sp cassette.
(I think I’ve got that right)
There’s also an 8sp version using shimano derailleur and mech.
Bike is currently 8sp campag shifting over re-spaced shimano 8 cassette.