Did you end up buying a set, Dan? I know that Howards stuff is reboxed Morel stuff. John Morel's website even lists Howards as a distributor.
I've used those lifters in both FE's and BBC's....and none of them have come back.
Of course how they perform has to do a lot with valvetrain weight and spring packages, but I've never had any trouble to 6000 and a little above.