I am in the process of building a 1954 full pressure 235 for my 53 Bel Air, I will be running a Harper intake with 3 Ford 94's, 848 head, Mallory Unilte ignition, And more than likely a Clifford header.I will be running .080 over forged pistons from Flatlander Racing at 10.5/1 The machine shop has suggested a 470 lift,275 duration mechanical lifter cam. Howard's suggests a 450 lift,230 Duration. Any input would be appreciated