Don,
I have the adjustable seats in mine. But if you're going with the Richmond 5 speed, the adjustable seat tracks don't do much good. That tranny is much wider than a toploader. When you install the transmission tunnel, you have to spread it to get it to clear the shift linkage. That forces the tunnel up against the side of the seats significantly restricting how far forward they can move. I could probably "play around" with everything to get a bit more movement but not having the seats move forward is a good excuse when my girlfriend asks if she can drive.
Chris