The running boards were the easiest to decide what to do with.  I started by taking my Dewalt Power Plane and taking a 1/64 inch off of them to get the dirt and grime off, then I sat with my chisels and cleaned out all of the little valleys of the dirt and grime they had also.  Next came the bed of the truck, that was also a no brainer, when I tried to remove all of the old bolts and screws holding the boards down the wood was so old and dry it just exploded and cracked into a thousand pieces, so those are going to be replaced with new, I am going to take chains and stiff brushes to distress them slightly.