Dead on 2 and 4

If the compression is good, the leak down test won't find the current problem for you. As mentioned, I'd pull that valve cover and watch the valve/rocker action first. If that looks fine, I'd then pull the carb and run an inspection camera down into the head ports to see if there's a blockage there somewhere. This is all assuming that there isn't a massive intake leak causing those cylinders to totally lean out.