can BB car 727 be installed in 4x4 w factory 360?

Rice Nuker said
OK.

So, the whole trans from a BB motorhome excluding the tail shaft housing will essentially hook into / bolt to the transfer case of a 4x4 housing?

No you have to use the output shaft from the 4x4 trans and the tail shaft housing from the 4x4 trans on the BB trans.