I've been researching this for a long time. The 6.5 is definitely doable and it isn't a bad motor if you use a marine application injection pump. Toyota diesels are neat, and I did have a BJ60, but for the power you get and the PITA to source parts and cost I've decided it isn't for me. BJ parts are a PITA to get here, imagine getting a 1HD-FTE and trying to source parts? I've finally settled on an Isuzu 4bd1t out of an NPR truck. I won't be doing the conversion until the earliest next summer. Hopefully, later than that. One thing to remember about a conversion is very rarely will you ever get your money back out of it. For 5-10k in conversion costs you can buy a lot of gasoline. I'm doing it because my 91 just doesn't have power or economy so I want to try something different. Plus I need a project. A Cummins 6 cylinder is not only too tall but way too heavy. If you do that conversion may as well just take your 80 body and drop it on a Dodge chassis.