I dediced to conclude my research with a new thread that would search based on the title.
Here is the 3Bar Bosch Style MAP sensor for the LS3/L76 Style Intake Manifold. Part Number 12592525.
http://www.atvci.net/~jcevanco/images/LS3_3BAR_MAP.jpg
Thanks to RWTD for the Calibration Data.
Linear: 312.50
Offset: -11.25