Everyone has their own opinions....
But a rev kit without sufficient valve spring is going to cause just as much damage. I'm not aware of any Edelbrock head (maybe a Vic Jr) that comes setup for a solid roller camshaft. The standard spring pressure is sufficient for a flat tappet or a lazy hydraulic roller, but is not anywhere close to what's needed for a high revving solid roller. The rev kit is not helping you there.
Some race applications dictate the need for 700-850 lb open pressures to spin high rpms efficiently. If you think you can get away with a rev kit and 300 lb springs, then so be it.....
My comment about the retainers and locks was because they use pretty standard issue 7° stuff. Not Super 7 stuff and not 10° stuff. I personally don't feel that is sufficient, especially for 8000 rpm jaunts.