You have time to sell the HR lifters and buy some solid lifters. Yes, you can run solid rollers on a HR lobe. Lash at .002 cold and run it.
Interesting. Sounds like many of the forums have recommended mrl however their website doesn't work. Is there a brand in particular that would be recommended?
Those HR lifters are a royal PITA, they will be noisy even if they aren’t having other issues, they are much less stable than even a HFT and with RPM they get worse.
Do yourself a giant favor and ditch the HR lifters. You’ll thank gregcon later.