Not familiar with this particular engine, ignition, etc, but basic mechanics tells me you have already diagnosed your problem in this:
Spark to coil = yes; spark to distributor = no;
Sounds like you have a bad coil. Check for cracks. Err!!!
This is what I first posted, then re-read your post and noticed that you had checked your coil.
I am guessing that you have done the obvious and replaced the coil wire going to the distributor? Depending on the wires, you may be able to interchange one of the spark plug wires just for test purposes.
Best of luck,
[Edited by smalltime on 07-12-2001 at 12:22 AM]