OK, so I have undone the 4 lower clamps on the inlet manifold rubbers. The material itself is rock hard. The clamps move freely when you push them with a finger so I know they are loose. But I cannot lift the carbs off. I have even tried a crowbar & a tyre lever but they will not lift off. They rock backwards and forwards inside the rubbers but won’t lift out. What am I doing wrong? Anyone had this? Any ideas?