Installing new gas tank questions ?

Looked on line at new gas tanks for my 70 Dart. There are plenty available and i saw only one that has 4 fittings on the the left side. I said hmmm that must be off a later Dart with heavy pollution controls. I looked at my tank and it doesnt have the vent tube on the filler tube, but has the 4 hoses running off the tanke into a sealed tube in the trunk ??? Is this a Kalifornia emissions setup ? I have a vented gas cap. Can I run it without. The vent tubes or am i asking for trouble ?

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