Dual plane mopar M1 intake

hey 67 hemi, how many miles on the mopar dual plane intake? I have been thinking about trying one. I am currently running an Edelbrock rpm air-gap manifold on my 360 magnum. I like the air-gap manifold, but My 360 magnum is in a 4x4 truck and I have been thinking I might get better drive ability with the mopar intake.