I bought mine from a dealership in MI in 1987. They said they had to drive it back from Sturgis, MI. When I bought it, it had 136 miles. I recently came across an ad selling the MOLDS to make these boxes. I called the guy and in talking with him, he verified the fact that the molds had been in Sturgis at that time and they were doing conversions on multiple makes (Chevy, Dodge, Toyota...) If you own one of these, Enjoy it.... They are not that common. I wouldn't wreck the box, that's what makes them different. I've seen variations in the boxes, the fenders on mine are squared off. Others i've seen are more rounded. I love mine and hope to have it for many, many years. If you want to convert it to a v-8, do it. Mine has been that way for at least 15 years. Just enjoy the truck.