Again: What part do you have in mind when you say "ECS canister"? If you're talking about the plastic charcoal can in the right front corner of the engine bay, then no, a '71 wouldn't have it. It didn't come along til '72.
225 / 904 combo . 2-outlet breather ; one line to the fuel tank , and one to the air cleaner base.
That's correct. The carb bowl was ducted to a nipple on the fuel pump body, i.e., a clear path to the engine crankcase. The breather used on '70 California and all non-export '71 slant-6s had only one small-diameter nipple, which is where the fuel tank vent attached. Some V8s used a breather with two extra nipples, one for fuel tank vent and one for carb bowl vent.
In no case were these extra-nipple breathers used in conjunction with a charcoal can. When the charcoal can came in '72, the extra nipples on the crankcase breather went away.
