73' B3 340 Duster pro touring build
I don't have any pictures, but when I looked at it last night it look pretty much identical to the third picture Wagon posted when he started talking about wiper motors.
Never wired it up, plug is pretty different, but it still only has 4 wires like the one on my Duster right now, so I would guess it wouldn't be hard to wire.
Pretty sure I grabbed mine out of an 88 Diplomat and a 90 Caravan. Swapped the parts around it bolted into the hole fine. Wire it up and I would bet it would work fine. Never got that far on my Valiant and haven't even put any thought into doing it to the Duster (but I am now).
About the delay wipers, pretty sure the motor doesn't have anything to do with it. I've thought about grabbing a switch out of a F-Body and the plastic box controller and wiring under the dash. Don't think it would be difficult. I don't think you would even have to get into the wiring past the firewall.