ethanol in gas bad for our cars?

I've been adding a quart of 2-stroke oil per tank to the old Mopars + Lead Substitute at the recommended dose, because I'm not sure about the exhaust valve seats. The 440hp in my Chrysler (with a new NOS AVS tuned perfectly) developed some serious issues that I can absolutely attribute to ethanol. It would surge at low cruise, lean out during hot idle and actually boil the fuel in the carb on a hot enough day to where it would starve at WOT.

Hate that shyt.