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3404speed said

73-76 will give you big bolt pattern. Dusters, Darts, Dart Sports, Valiants

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Yup, it's a bolt-in if you include the shock plates, u-bolts and a shorter driveshaft (or have yours shortened). As mentioned, the wheel bolt pattern is 4 1/2" instead of your existing 4" pattern so you'll need new wheels also.