I don't understand why this has been propagated by the media so much, it is rather annoying. From the viper books that I have read, it all started when Lutz was driving his Cobra reproduction to the Chrysler office and he started to feel like he wasn't exactly doing the right thing, parking a Ford powered car up front. One day, he went outside and took a flathead and pried the "powered by Ford" label off the side but figured that wasn't enough. He poked around as to what engine Chrysler made that he could put in the car but they only had the 360 which was an anchor. From that he started to think of the V-10 that was being developed for the truck but was not yet ready. The idea of an 8L V-10 in a sports car was exciting to him but he realized that the specific engine they were developing wouldn't work for a sports car, but it was the idea that stuck and ultimately lead to the creation of the viper.
I think that most people here know the whole Lamborghini story and that what they did to develop the engine was largely thrown out as chorps stated because the characteristics were not what the team wanted. The truth to it all is that Shelby was very animate about having a v-8 to save weight and didn't like the idea of a v-10. Shelby considered himself on the project more in name than anything else when everything was said and done.
No, it isn't a truck engine. No, it never was. The size and cylinder count served as an inspiration for what the viper was to become, but that is about it. Think about this, if the viper used a truck engine, how come when the viper engine was put into a truck, that was a big deal? Wouldn't that be just putting a truck engine into a truck? Silly.
Anyway, I understand that most automotive journalists don't know a great deal about the viper. It isn't like they have owned several of them from different generations like much of us have. Most likely, they haven't even driven all of the generations. It is a low production car and they have to know a lot about a lot of cars. The specifics of how many generations there have been, where the engines came from, who did what is lost and some guy who knows little about the car has to bang out an article. I think that it would be wise for the VCA to write the magazine editors when this misinformation is propagated in printed media just to start to get the truth out rather than let these silly stories build so much momentum.