Glenn Lyford wrote:

I've got two of those motors, and three carbs between them. The new
gas still manages to gum them up solid.

What new gas are you talking about?

I have been getting ethanol blended gasoline
at the local Farm Co-op since the 70's

And no it doesn't gum up carburetors
Quite the opposite it will clean out
gummed up gas tanks

-jim