With some modifications to the Chevy sheet metal it could work. Don't expect it to just bolt on as is. Look at the front end of that era Oldsmobile and note the differences in contours around the hood and front fenders. The olds has a flatter leading edge on the hood. Google images of Olds from the period. 1948 98 Series is different than '46/'47 98's. The other series are the same all three years. Ray
46 Chevy SD with a 46 Olds grill. Note Chevy hood to Olds. Here's a close up of Olds with OEM grill & opening. I'd make a cardboard template off an Olds grill and mounting points and overlay it on the Chevy to determine what needs to be done to mount it and sheet metal modifications. The Olds has individual gravel trays on each end, I think the Chevy might have a single side to side gravel tray?