I hope you don't mind my saying this again, but testing the spark across the gap of a spark plug in open air is a meaningless test. A very weak spark can jump that small gap in open air but will NEVER jump the same spark plug gap in a compressed fuel-air mixture in the combustion chamber. Since you never got fire even with starting fluid, it points to the ignition. But you have to stop testing your spark wrong ; it's just misleading you into thinking that it is a good spark if you test with a plug in open air.
I don't see you mentioning a new coil in this, or a new condensor. Either can cause weak/no spark.
