Solid Rollers on a Hydraulic Grind Cam

There is not much "clearance ramp" and as mentioned aluminum heads (and blocks) and Iron are different
Me I'd check Isky and Crower they are the most likely to spec their own stuff Crane back in the day IDK now
The problem is the lifter
If you want some more low end Mike Jones could touch it up with an inverse flank cutting the intake duration maybe 10 degrees (advancing the intake close point say 4 degrees
you can feel 4 degrees, or convert to a solid profile- but let's try and find some good lifters
you may have to pull the heads :)
what's wrong with the HR
what size roller do they have (you may have said but I'm tired)