They used Yellow Pine planks for the bed floor & was a marvel to get 15-20 years out of it, A nice Oak replacement kit runs @ $1200 & then requires fitting.
Both myself and the seller have been too busy to work out the finer points of this but he's confirmed that it is a 350ci engine of that era, and will get me the details on it after Christmas.
He's assured me it's a rust free truck, including the frame and underbody.
More details and some pictures to follow but so far so good.