Not Ranked
A couple items to note:
I agree wth Z-link you are bouncing off the backside of the cam, you accelerate up the ramp and lift off the peak and the spring pressure can keep the roller on the cam. You would see spalling more than wear on the cam but you would ruin the roller bearings in your lifter due to the hammering. Absolutely no reason to run solid rollers with your spring pressure, you could have EASILY gotten away with standard off the shelf ford racing hydraulic lifters if you only needed 400 lbs, My bet is you need close to 450 lb which is the highest I would run hydraulic lifters not due the hydraulics but due to the roller bearings.
Keith Craft has some high rpm lifters, he modifies Ford Racing i think, set at 1/4 turn preload and you will get another 500 rpm before instability, needless to say the highest I would turn a hydraulic lifter is 6000 rpm's which should be right for your engine.
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