You will find it a lot easier to get the carbs off the intake manifold if you take the whole intake assembly off the engine by removing the 4 nuts from the RV cover. Also, once you have the assembly on the bench, you will find it easier to remove the front nut off the front carb if you first take off the throttle bell crank. Oh yeah, having the Mikuni carburetor wrenches helps a lot.
Chester