Highest LIft cam with 68 340 with stock intake and carb

With stock intake and carb What is the highest LYFT camp you can get away with my motor has a 585 lift, just wondering if this engine is being held back by the stock intake and carb it does have an MSD ignition thanks all for your input
Johnny


What rockers do you have? Have you verified lift at the retainer? What is the intake and carb?