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The 4th gen Ford vans got way more rounded corners, flush mounted glass, composite headlights, (etc.) and all of that improves fuel mileage.
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One option would be to trade up, but the 'for sale' sign and the new tires suggest this is a new purchase. If you look at the template overlay you see that to get a 100% boattail would double the overall length of the vehicle. The only practical way to do this would be with a trailer. IMHO better to follow the practices for a box van.
Ignoring the drag of the cab to van gap, there is 30%+ occurring under the vehicle. A belly pan (w/ diverter) and four-wheel skirts alone would put you past the 4th gen Cd.
Instead of an airdam, why not replace the whole bumper, following aerohead's suggestion for a 'padded bra'. It could push out to the profile you see on the VW LT5 and have clear headlight covers with a nice sideways radius. Add a bump on each side of the hood and let the center and the grill area be recessed.
Add fillets behind each exposed hinge on the side doors.