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The Hudson big 6 (232, 262, 308) block is exactly 2 inches shorter than the 254 8. All of these engines were used in the stepdowns, using the same motor mount holes, only having to remove the sheet metal filler in front of the rad. and rotating the rad. mounts 180 deg to move the rad. 2 inches forward or back.
In the 46/47, the big 6 will mount in the 6 cyl radiator holes, as did the 254, and the rad. goes on the cross member on Z brackets as it does for the 254. Don't know if anyone makes these if you can't scrounge them from an 8, but I made my own.
The big 6s (and the stepdown 254s,) will have an inch or so interference with the steering shaft. There is room to move the steering box up on the frame to help this problem, or cut the shaft shorter, or relieve the block to clear the shaft. (Incidentally, the 36 had a vertical adjustment of the steering box on the frame to position the steering wheel up or down.)