Mick,I have one on the 455 in my 69 bird.SP II cam and 3310Holley.For the gearing in my car I think I might swap a Perfomer.3.31s in the back and a .67 OD.Around town I’m 1400 RPMs or so and 2000 on the highway.I think the engine will be more happy with a dual plane.Tom
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