904 band adjustment for a 408 stroker???

So if I were to make it fit, wouldn't I just have to modify the tunnel for the O/D unit "bump out" on the case and the mount? but what about that solenoid stuff and a switch needed to be put on the dash I heard about? any of that true for a non lock-up O/D trans?

I believe that's all that needs modified. Do a search for 518 and/or overdrive in this section and you'll find several threads about doing it. Some even have pics. You will have to have a way to control the o.d. unit as it is electrically controlled. You don't need to put a switch on the dash if you don't want to. You can make it controlled automatically with a vacuum switch. Here's a link to how to do it a couple ways. It's near the bottom of the page. Warning this page has a ton of info and pics and takes a little while to load even with HS internet.

http://www.transmissioncenter.net/dodge.htm