Charcoal cannister

Hi. I have a 74 Duster with cannister as shown. It has 1 line going to top of carb port, and the purge line going to port at base of carb(Carter BBD). I'm going to be switching to a 4 barrel Edelbrock which does not have the carb bowl vent port and the only port the purge line would fit is marked for pcv valve. Can I tee the purge line into the pcv line and just cap off carb port on the cannister ?
Next question is, should this have a purge valve attached somewhere on the purge line? Is it built into the cannister?
Thanks

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