No, they had some shorter (I believe 1/4" and maybe 1/2").
Without getting too far into hydrodynamics, I thought the length would restrict more and plus maybe easier to install.

'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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