Really? They're often out here inexpensive with over 370k on them- it's driving all the value out of one to where even near perfect they just aren't worth much. A shade more power than a 5.2, not really much less than a 5.9. The lil 4x I've got with one gets over 18mpg out on the road- it's been over 21 on sustained road trip in the Summer with some sense. They give a bit less trouble than the Hemis which is still plenty. Aftermarket doesn't exist. I won't complain about one in a vehicle but I wouldn't be swapping one into anything except the slim possibility of something with a 4.7/5.7 that I couldn't be bothered to want to change the wiring on and didn't have to spend that much money on the swap.
A while back they were still selling for around $1000 as runners instead of the $250-600 of most Magnums.
Yes- far as I know all overdrive vans '96-up are OBD-II. But not all '96-up vans have overdrive. In 360s the latest I've seen was '99 for a 3spd van and apparently they are RH transmissions.
You've not seen 3spd vans before? Usually the ones I see are either 3.9s or 5.9s.