correct. the cranks are identical. the main will swap. yes it should be line bored. the only difference between 235 & 261 is
1)the bore size,
2)261 had heavier rods,
3)58-62 261 had full flow oil filter,
4)261 had the steam holes in the top of the block & in the corresponding surface of the head.
any thing else will swap between the two engines & a 235 head will work on a 261 after it's drilled for the steam holes.
robert.
