To find it definitively, you should:
1. Consult your owner's manual: This will have diagrams showing the location of major components.
2. Look for a relatively small, cylindrical component with several wires connected to it: This component will usually be near the spark plug wires.
3. Use a repair manual or online diagrams: Searching for "1994 GMC Safari [engine size] ignition coil location" on Google Images or a repair manual website (like Chilton or Haynes) will show pictures of the engine bay and highlight the coil's position.
Important Note: Always disconnect the negative battery terminal before working near any ignition components to prevent accidental shock or damage.