The 96 & 97 B'villes 97 GP'* and 97 Regals all had a vacuum tree by the BBV on the supercharger. One of the branches heads over to the fpr, the other to the BBV or BCA for the SC'd term.
In 98 GM changed up and didn't drill the hole for the vacuum tree. From that point on they used a T under the snout into the LIM and ran line forward from the LIM.
All years had a branch going from the LIM to the map sensor(*). There is no difference in where you choose to get the vacuum on a 96-97 (LIM or vac tree). Many upgrade their chargers for ported ones and change over the vacuum lines since most vendors won't take 96-97'* as cores.
Side note: 96 was the only year of the Gen 3 M90 SC to have coating on the body. All years has a coated nosedrive.
00 Regal GS: All kinds of cool stuff.