I got a 409 W-block motor out of a 1965 heavy-duty truck (it was actually a grain truck used on a farm). The engine was mated to a 9-speed truck tranny and had a huge air-compressor on the front for the air brakes. Is this engine block any different than the 409s used in the cars of the time? I'm trying to sell the motor and am hearing rumors that the truck blocks were different and are not worth any money. I've heard of folks pulling 350's out of school-buses all the time, so I'm just trying to find out if the engine I have is actually worthless or if someone is just trying to convince me to sell it cheap. Any info/help is greatly appreciated!