I'm building a new bike, and I'm about to install the cranksets.

I'm going to crank on some Sugino RD2 cranks, and it specifies a 103MM BB for a 45MM chainline.

I have an old 108MM JIS BB and I was wondering if there's actually any problems with installing a BB with a longer axle than what's recommended?

Would the crank even fit properly or would it be "loose" on the taper? Would the axle protrude out?