You will need to position the cab in its proper place. Start with the front cab supports, making sure that they are not rotted out.
Next check the front and rear cab mounts. They must be in good condition in order to set up the space between the bottom of the cab and the top of the frame. Specs are in the Truck Shop Manual.
Once that is done, you can adjust the hood-to-cowl gap, and the radiator support height which is how you set up the hood closing height. When you are done, the hood to cowl gap will be 1/8 inch and parallel the full width.
All this is done with all of the fender bolts loose and the fenders shoved down and out of the way of the hood.
Once you get that far, you can raise the fenders up an bock or forward to align them with the hood.
Come on back if you have more questions.
Carl
Last edited by 52Carl; 01/18/2018 1:18 AM.