Jason, some of the earlier carbs would corrode, or their seals went to shit when exposed to alcohol-containing fuels.
It was a common problem on certain carbs--the old Dodge Omni/Plymouth Horizon was notorious for that, and once they started to corrode, no amount of cleaning would EVER get it right again!
The trick there was to get a new carb, and spray the inside of the float bowl with an epoxy paint to seal the metal, and then reasemble the carb.
Carbs of current manufacture have better metal and seals just to avoid these kind of problems.
So, yeah-sometimes it is just easier to get a new carb, cheap or not!