Hey Dan you will like this one, I mounted the brake booster under the cab (I will admit I have followed your thread and borrowed a few ideas) anyways, I finally decided on a floor shifter and bought the Lokar shifter kit. Got it and the mounting point is absolutely exactly dead center behind the brake booster.
I remember a comment in Classic truck magazine about slamming your hand in the truck door before beginning a project, and it felt just like that. After some cutting, welding, cursing, I have a shifter.
Lucky I am doing this for fun.