The 54 hood, fenders, and grill parts will fit on an earlier cab with no problem. You might consider selling those parts and finding another truck instead of the 48 that is in better overall shape. That 54 grill is very desireable and could get you a good sum of $$$ in the swap meet or better yet - Ebay. Probably get enough from the grill to fund most if not all of the new truck.
