Here is the first (LHS) carb boot / manifold. This is a cast (looks like iron) part on the engine side and a rubber manifold on the carb side. The rubber O ring gasket (now completely crushed flat) seals the metal part of the manifold against the engine.
Really don't know if I will be able to salvage these manifolds. They are pretty rusty engine side. Obviously new O rings required.
Paint has flaked of the metal (engine side) flanges. How to clean that up without damaging the rubber. Rubber is still pliable so I think I would be able to get a good seal with the carbs.