If you got spark at the coil, I'd say the ignition module/pickup parts of the distributor are good. Spark at the coil and no spark at the plugs is a bad rotor or cap.
Now comes the pain in the butt part, your dist is under the water pump. Yep, the pump has to come off and you need a small torx bit to remove the cap, don't know the size. I know mine by sight, had to grind it down some to fit in the recess where they stick the cap screws. And they are small, did I say that? Be careful tighting them up, don't need to snap one. The rotor is held on with them too. When you take the rotor off, the optical wheel will fall off too. Pay attention to how to lines up and don't bend it. It's made of beer can material, well close to it anyway.
Don't know about aftermarket parts, GM sells the cap and rotor as a kit.
If you plug wires are old, might be a good time to put new ones on. Would be easier since you have room to get to them with the water pump off.
Tip- The water pump on this car is camshaft driven. It uses a small splined coupler to connect them. Make sure it's on the pump your putting on the engine or you'll have a mysterious overheating problem.
Edit- That sould read INVERTED torx bit.
[This message has been edited by msb (edited 02-23-2002).]