I have a 1977 ford F350 with the 330 XD duty engine. My truck was a U haul but I've taken the box off and I drive it every day to work. It rides like a tank and gas milage is crap! but it starts every time and people seem to want to know whats up with the long frame and no bed thing? Oh the truck is now blue. I recently installed new thermostats in it because someone took them out and I had no heat yes two thermostats in this wierd cast iron square box in front of the engine and my father in law installed a third one on the block where the box goes into the block, there was a place there for one to? probably did not need one there. anyway I have heat now. I do like the truck and my kids love the truck. my truck has all the specs and stickers on it that tell alot about the engine if anyone wants the info.