The 230 is about 29¾", right?
I guess the 245 flathead would be 31" or very close to it.
That the slant is 31½" is a bit of a surprise, really, as it has the water pump offset to enable the overall length to be shorter.
The 245/265 Hemi 6, meanwhile, doesn't have the offset water pump and is has bigger bores (up to 3.91") and is 32½" from the bellhousing face to the water pump flange.
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