I have a 622 ci RB with B1MC heads (with 1.7 ratio T & D rockers). The Crane solid roller cam now in it has .850" valve lift, duration @ .050" in/ex is 286/306. The owner wants to replace this cam (because of too many clearance issues) with a cam that will yield approx. .800" lift with the 1.7 ratio rockers. This engine will not see more that 7200-7400 RPM's.
I'm looking at two cams, 1st is a Lunati, duration in/ex @ .050" 282/290 and .806/.806 lift, 2nd Comp Cams, duration @ .050" in/ex 285/292, lift .800/.800
With this size engine, how much duration would be best with .800" lift? We really would rather stay with a "off the shelf" cam, not a custom.
Or is there another choice that I'm not seeing?

Thanks, Brian