inline 4 speed

Hi all, I have a buddy with a 1970 Swinger. He has had a Stroker built and almost ready to drop in. He bought a A-833 4 speed, rebuilt with Liberty gears etc. He is looking for a inline 4 speed box to get away from the H pattern. Can anybody help? Where can these be had? Better yet,Does anybody here have one for sale? Thanks in advance, Craig.