Thoughts: Taking B-body axles to A-body length

you say they're 35 spline Moser axles. being so you can cut them to the length you want because they may not neck down.

measure the length of your splines

you may not have to respline them.

by the way you'd cut them at 28 in not 27 and 3/4 because you're using the bigger brakes.

another way to do it would just be cut 3/16 or so off of each axle and stick them in the spool if you are running green bearings.
if you are running tapered bearings get an exact measurement so that they touch inside the spool in the middle and then you can adjust your free play.

I have used a chop saw to cut axles off in the past without a problem.