What do you want to know about the "history"?
It is part of an engine family that traces its origins back to the first in-line liquid-cooled engines that VW began building in the early 1970's, although there have been so many evolutionary and revolutionary changes since then that there are no parts in common. There are some telling dimensions that have always stayed the same ... notably, the 88mm spacing between cylinder center-lines and the locations of the fasteners that bolt the head to the block.
formerly ... 2006 Jetta TDI 5-sp, Spice Red, Unitronics stage 1, 0.681 5th gear.
and before that ... 1996 Passat TDI, Silk Blue