Have you checked out the 73 to 79 forum. Someone there should know what you need to make this swap. Your close. I'm only 40 miles from Ruston. I will look for a 79 parts truck around here. Will 1/2 ton parts work? I figure the pump & hoses are the same. I sold all my old trucks for scrap. I had 5 or 6 parts trucks in the 70 to 79 models. They were about stripped anyway.