It looks like you may need a spacer. This is a low deck M1 4500, so not sure how close all the 4500 intake patterns would be, but for this one you will either need a spacer that is cut back or do a little grinding on the intake.

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'75 Plymouth Duster
Phase I 451 906/590/2-660 10.75/126
Phase II 451 Stage VI/590/1050 9.82/135
Phase III 383 906/Victor-Pump gas 11.30/119

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