So now there are sparks at the coil, but not at the plugs.

I now you've replaced the distributor, but I suspect the small black block (sorry, don't know in English, something with Hall....) to be faulty.

Maybe you could check wether current from the coil is arriving at the dizzy at all.
If there is and the current stops there, something must be wrong with it.

Apart from that, you should do something about the alternator, a constantly lit battery light is not good. Means the battery loading circuit is having a problem somewhere.

Cheers