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It'll be tight! It's tight enough on my old, 'narrow stays & tyres' PC with a BB spindle 2mm longer than standard. Gap to stay is currently approx. 2mm (see post #3065, previous page), so must have been 1mm with previous (SG75) BB.
There's an indentation/scuff to my powder coat in the location where the spider used to rub the chainstay under load when using the old BB. Scuff was flatted off/polished out a bit before I fitted the new BB but you can still see the indentation.
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They claim they've fitted a 75 without problems. I'll try to borrow a set this weekend and try myself.