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@Rod_Munch
80mm would probably be ok BikeBuilder (mine looks to be similar). I assume White's calculations are based on giving a cautious guarantee of a 5mm gap which would be fine on an MTB but unusual on a track bike (my previous chainring was so close it would scrape the paint when honking up hills!).
Kerley is right though - it's much more likely that you won't be able to tighten the crank arm down properly without it (or, in this case, the lockring) hitting the cup.