42RH / A-500 in a Duster with pictures.

Here you can see the area that has to be removed to clear the overdrive section. The letters A indicated where I used a ball peen hammer to move the tunnel outward which gave me enough room for case clearance AND enough room to cut out the cross-member.

At this point I have ample room to install the transmission, indeed it is in the car as we speak. I'll take a picture this afternoon and update the thread. There is NO cutting of the floorpan required to do this which is a bonus in my book.