Air Shocks

Here are the rear air shocks that will work fine, give you a little lift, and ride real nice yet too.

Rockauto.com
'74 Duster >318>Suspension >Shocks

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Do not buy the gabriel hijackers, ride way way too stiff.

I've go Hijackers on my Dart Sport, and it rides just fine. Only run about 30 lbs. just to level it out.