Variable hydraulic lifters for 440 engine

@Bighead440
I understand that,and I like it, But what are your thoughts as to valve float and PV clearance, using that method?
How fast are those lifters at 6500 rpm, if the valves fly off the nose? or bounce off the seat?
Regular lifters have a plunger travel approaching .125.
So if the Rhoads are the same, then being off the bottom .035, allows .090 additional plunger travel. Does a guy have to re-engineer his PV clearance?
How about installing some height adjuster/ travel limiters, inside the lifter bodies