[patty442]

You must defeat the peen before you have any chance of removing the throttle blade screws. Take the carb off the manifold, invert it on the bench and take a Dremel tool and CAREFULLY grind the peened portion of the screws before attempting to unscrew them. Unless someone before you has messed with the screws and blades in the past, your problem is unlikely blade sealing. There is a compound used by GM/Rochester division to improve sealing of throttle blades on end Tripower carbs in the late fifties and early sixties. It has worked wonders on big Hilborn blades and Lucas timing injection blades that have been beaten up by heavy handed engine builders and tuners. Please make sure you really want to mess with the blades before you start grinding.