I thought hughes roller lifters were made just for this specific problem?
They do and they work. My 408 was built with Crane retro rollers and#5 exhaust came up (.571"lift) just high enough to bleed off and tap (hot). I bought the Hughes lifters, another set of pushrods (different lifter length) and with the intake off and a priming drill set up , after setting preload, rotated the engine by hand with 70 psi on the gauge ,rechecked for bleed off. All was and is good.