Wicked issue with 4AC

[el_camino]

Hello guys, I am trying to build love to a good condition AE86 with 4AC and keep it original for the moment. 

There is not logical issue however and being out of ideas I am reaching out for help.

The cylinder one refuses to work, no matter what.

There is spark, a good one. Distributor revised.

There is fuel. Tried with different carb from working 4ac.

There is good compression on all 4 (12).

Valves have been adjusted 3 times and are in spec.

The car is running smooth on the other 4 otherwise, starts first try. Runs rich, I assume due to the not burned fuel in cylinder 1.

I am really out of ideas what to do next. Anyone had a similar problem and ideas for testing please?

 

 

Edited 55 minutes ago by el_camino