Don't spend too much time on memory lane. These old boxes aren't going to pay the bills for you.

Info & pics on these sites:

Domestic Truck Tranny Guide

The Novak Conversions Transmission Information Gateway

As far as top loaded vs. side loaded, it seems the top loaded method was the way to go for the ones you list, but the newer stuff is end loaded with the guts going in the end of the case.

You can download a catalog here with a blown up drawing of all of those transmissions:

http://www.motivegear.com/pages/catalogs/catalogs.htm

Overhaul kits here along with some info:

http://www.drivetrain.com/parts_cata...overhaul_kits/