It depends where you get the motor from. Anywhere from $300-800 I've seend for a motor.
The GTP Supercharger will NOT work on the 94.
92-93 bonnevilles used the Gen 2 M62 SC on the Series 1 L67, and 94-95 used the Gen 3 M62 on the Series 1 L67. 96+ used a Gen 3 M90 SC on the series 2 L67, which is compatable with the 97+ GTP'*.
Basically no parts swap from Series 1 to Series 2.
You could use a bottom end from a 92-95 L67 motor, but would need to use your LIM, SC, TB, fuel rail etc.
And I asked about your location because I have a 68k mile 94 SSEi motor in my garage I am looking to get rid of for cheap, but shipping would be a pain.
2007 Saturn Aura XR | 1970 Chevy Blazer 4x4 | 1970 GMC 3/4 Suburban 4x4