PCV issues?/hesitation

Look at the carb mounting gasket on both engines. See if they are the same. Without knowing what you have, I'm poking around in the dark. Since neither engine has the original intake/carb I don't know what you have. That's why I asked if you could post any pictures. Myself, I have trouble posting pictures.
Are both manifolds cast iron, or one piece cast aluminum, or welded 2 piece aluminum?