So some interesting observations and realizations. There is something of a 3/16" delta on the right side and left from top to bottom. Also, right side gap overall is about 3/8" greater overall. Bear in mind this bed came from another truck, so I may crack all the bolts loose and shift the thing to even out the gaps. Another thing that struck me was the fact that there is a weird spot in the bed floor, like something really heavy was dropped in the frontish rightish area so there are both low and high spots. This could certainly be part of my issue. In addition, the front rail of the bed is tweaked like something whacked into it so now I feel kinda dumb for not taking all of that into account. Could we expand a bit more though on this crown issue that was mentioned earlier?
The truck has been a bit of a project, but there were bits of it in such great condition with such low mileage that I couldn't pass it up. Plus it came with a blower. Here is how I bought it.