What did you end up doing? Was the bb spindle the right length and were you doing a singlespeed?

I am doing this same thing on a 70s Raleigh Sprite. I've got a sugino xd crankset that I intend to install as a single speed with the velo orange grand cru threadless bottom bracket. My only real question is which spindle length to buy to achieve the correct chain line. The crankset has holes/threads for a triple but I will only use one and ideally the outermost spot for the chainring. 71mm bb. Any tips?