[DAVID GAGNARD]

The 5.0 Mustang drag race guys have been spinning their engines to 7000 rpms for years using the stock factory hydraulic roller lifters from Ford with little to no problems.....
You can get 6500 rpms out of a hydraulic roller set-up easily....You will not be staying at 7000 rpms very long, most likely once you hit that number, you'll be shifting...
I wouldn't hesitate to go with a hydraulic roller set-up instead of a solid cam set-up for your intended use....
Little to no maintence and easier on parts, also larger selections of cams to pick from.......

Just my 2 cents on the subject.....

David