The 85 - 86 fenders will not work with the 80 grill. If the cab, fenders, & hood are that clean then I would imagine the core suport is as well. you need this to run the 85 - 86 grill. Is the 85 - 86 cab and nose still on the truck? I have swaped cabs with the entire nose intact before. Unbolt the cab mounts, steering, shift linkage, brake lines, ground wire from frame, tail light harness, & lift it. I used a 6x6x through the windows and a strap down to the top of the radiator suport.