Ok, first we have to work with the same definitions. I'm doubtful we'll get there, but here are mine:
Elitist
(1) someone who
believes that some things should be
controlled or
owned only by the
richest or
best educated or "best"
people:
(2) relating to or supporting the view that a society or system should be led by an elite.
(3) someone who thinks that the richest, smartest, etc. people should not only rule, but that they are also better than the rest in some moral sense.
In this sense, I think there is no doubt that the founders, who designed our Constitution and thought it would lead to our best and brightest being elected, were elitists.
Conservativism
Conservative philosophy, in general, is a realistic one and it considers it a matter of fact that some people are better than others because that's the way human societies have always been ordered. Maybe I'm operating off of a more philosophical view of what conservatism is, ala Oakeshott and Scruton, and you are focusing on the Tea Party and MAGA movements within the Republican party (which I would argue are not conservative, but right-wing radicals):
Given this philosophical definition, though, the founders were arguably not conservatives. I think elitism can exist in a liberal, Marxist, or conservative framework. They are independent of each other.
As for the Iron Heel and Marxism, Marx didn't invent class distinctions. The Iron Heel detailed socialist thought at the time--but it also detailed the societal conditions they were reacting to. Those people had reasons they thought like they did. The socialism discussed in that book, though, was utopian and certainly imagined a nearly perfect egalitarian society. Conservatives, by definition, are anti-utopian, though and so do not see egalitarianism in that sense possible and should not be strived for.
The way you are defining things here looks as if you're trying to put everything you believe is right and good under the banner of "conservatism" because you identify as a conservative. But of course I might be reading that into your brief messages. Are you doing that? Are there beliefs that are core "conservative" ones that you do not share or question?