There's a seller on ebay that has a general CD on dolphins, 1980 on, which does cover components of my 79.
Had trouble finding the right distributor for engine, found that the truck chassis were actually built the previous year. Once I started getting '78 parts, everything fit. Chilton manuals are great for under the hood. Have it pretty much gutted, and planning updates. Was pretty overwhelming when I realized the extent of water damaged framing, but moving along, reading all the great advice we have online.