4 Speed O/D???????

Ok guys, heres one I need help on... I came across a full size van in the local junk yard... it's about a 1984/85 and has 3 big custom windows down the left side.. also has a big stripe going down the side and up over the rear roof area and DUDE written in it, it also has the Aluminum Factory Turbine wheels and heres the kicker.... it's a floor shift stick... mounted to a 318. I've seen 3 speed O/D's before but on the shifter handle it has the shift pattern still visiable and it's a 4 speed O/D.. the O/D gear is to the right of 3rd gear.... anyone know of these or have seen one before.. I've thought about what gas miliage it would give in a small block "A" body and I can pick it up REALLY cheap... let me know what you think... here or at.. [email protected]

Thanks,
Bryan