I don't know about the grill.
About the gas tank though..... I have a 1950 Chevy 1/2 ton. The gas tank sat inside the cab behind the seat. I thought it a bit dangerous plus I wanted to add weight in the rear. What I did was buy a steel tank to mount under the bed. Since I have a blow torch and welder, I bought some 3" 1/4" steel stock and modified the chassis to mount the tank. Most people put the fill spout out the fender but I put mine through the bed with a flush mounted aircraft type filler billet.
