Optispark Problems
Check all the easy stuff first. The Opti shouldn't just stop working all of the sudden. It would have shown prior signs of failure.
SEARCH will be your best friend.
As you were just working on the car, it's very likely that you disturbed something.
Here's some actual help. Lets start with confirming spark from the coil:
Unplug the spark plug wire going into the distributor from the coil leaving it connected to the coil. Plug in a spare spark plug into it. Lay the plug onto some metal thing and have a friend crank the engine. Is there spark in or around this spark plug?






