Bottom bracket size help

RadioShed

Old School Hero
So I've bought the frame of an Orange P7 RS from 1996. My intention is to fit XT M739 groupset, but I'm struggling to work out the bottom bracket I need. Help please.
 
Shell will be 68mm (or measure it, it literally is the width of the shell)
But axle length, depends on the crank.
The FC-M739 will want a 110mm axle on that frame.
 
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