We asked Bobby about regular D44 Longs about a year ago. There's room in the knuckle, but not enough room in the spindle hole in the knuckle to actually put the Long in. A Ford outer is slightly bigger than a Chevy outer, but you'd still have to have a Long that is smaller than the Toyota mini Longfield.
I wonder if you could run 30-spline 10-bolt side gears in your locker/carrier to get a 45º pressure angle to match the Long chromo inners?You would need custom shafts. The pressure angle is close enough for D44 shafts to fit in a toy 3rd, but not vice versa for some reason...... I haven't tried personally but have read it several times in the toy forum.