Anyone Know What This Is ?

Not sure this is the right place to post this but it does have an electrical connector from harness plugged into it.
It`s mounted on back of engine block near distributor. Double blade connector w/ ports for small hoses.
Looks to me to be some kind of emissions thing. Not sure it`s needed at all.
On my 72 Challenger 318 auto / PS / PB / AC /Cali built.

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