Green_98,
Back in the day, they used to cut the top piece of the radiator support frame on both sides. Removing that and piece of metal with the latch hole in it allowed more room in the front to pull the engine. That's been done twice with my '48. The second time, they didn't weld it back so I took advantage of the extra room.
Cuts in top radiator frame piece. I once looked at the approx. 31 AD trucks that were in the local yard and many showed evidence of cutting that radiator frame piece.
The 261 slapped right in. They make a water pump adapter to better center the fan since the pumps of the 235 and '61 261 are of different types and are at different heights.