73 340 emissions questions

Hi, my 73 Duster has all the original emissions equipment still connected, Can I disconnect any of it and expect the engine to run decent? I'm sure the charcoal cannister is dirty and although I've looked at the EGR valves in the manifold and they look OK, I'm not sure if they are working properly, since none of these items can be bought over the counter, its certaily easier to just disconnect if possible, your opinions please....Thanks
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