340 runs on only 4 or 5 cylinders after backfiring

I was having a problem close to that . I had bad 87 octane gas with ethanol that had sat for a month and a half. The fuel inside my edelbrock separated and what was left is the fuel and the ethanol turned to a clear wet chunky gelatinous stuff floating around in the bowels and clogged up the jets and passage ways in the carb . Made it seem like it was running on 3 cylinder on my 360 had to clean out tank and flush fuel line and clean out carb with carb cleaner and a air nozzle . It also smelled like it was running rich also? Now it runs great . I run 91 no ethanol. Try dribbling some gas in the cylinders and put plugs and wires back on and try starting see what it does? let me and the others know on any of the tests you do then we can try to figure some thing else out?