Dodge Van tow vehicle ??

I believe they first offered big blocks in '75. I have owned a '74 and a '75, the opening where the dog house fits on was definitely wider on the '75.

The '74 with 3.73 gears got 12-14 mpg, no matter how you drove it or the load. The '75 with a 360 and 4.10 gears got 9-11 mpg, no matter how you drove it or the load.

I swapped a Cummins into the '75 and changed the gears to 3.54. After that it always got at least 15 mpg, 22 mpg with no load at 70 mph. I did get 17-18 mpg going 70 mph hauling a car on the flatlands, getting mileage like that while towing was a routine experience.

I towed cars out to Bonneville several times starting in '88. The 360 worked hard to cross the Rockies, the Cummins barely broke out in a sweat.