The 74 Super Stock heads were aluminum, had a Chrysler part number, and they were/are great street heads in the untouched form, and could be made to perform very well when ported.

You'd need dual plug valve covers, two sets of wires, two sets of plugs, and a dual plug distributor.

The nice thing is that for the most part, if you don't like the dual plug setup, you can get plug blockoff's- the kind made for 80's dualplug superbikes work great- and turn your dual plug into single plugs with a change in valve covers, distributor, and wires(ie you eliminate one set).

Dual plugs look cool, but there's not much reason for them beyond that unless you're at the top end of alcohol or supergas performance.