Dodge Van tow vehicle ??

The van will pull a trailer just fine. Like RRR said, you won't notice a lot of difference in MPG between a 360 and a 440 while towing. The difference you will notice is the big block will roast your leg because the exhaust manifold is so close to the dog house. There may be a difference in the dog house for a big block and small block? Not sure on that one? The van will need a passenger side manifold that dumps in the back, not the middle. If you get that far along and need one, let me know. :)