Yes! Your in luck. i assume you are talking about the screws that bolt on the float bowl. take a good phillipshead and a hammer. Turn the carbs upside down. place the phillips on the screw and at the same time TAP THE PHILLIPS (pretty good taps) and turn at the same time. This should loosen the screws. I feel ya buddy, it happened to me.
that works but an impact screwdriver works best....its a screwdriver that takes different size bits and has a large metal plate to smack with a hammer. The impact of the hammer results in a twisty motion and will usually break a stubborn screw or bolt. good luck and change out those philips for allen bolts available at any hardware store.
Try this if your screws are stripped...IF you have a hacksaw: take off the blade and use it to file a gap on the head of the screws for a flat blade screw driver. Make it big enough to fit a larger flat blade, small enough that the gap isn't as big as the screw head. I've seen this work before..Just a suggestion..