I would say as long as you stay under 4k your ok. Pullers and drag racers who make power at 4500 5000 rpm and hold that rpm down the track usually go with a roller setup.
I would reckon there would be a market for a support system for the oem rocker stands. Something like a 1/4" inch thick base plate to make a fabricated valve cover work, replace the short head studs between the valve covers with long ones, then put a trunion on them to grab the end of the existing rocker shafts.
I'm kinda surprised no one has made this yet
What ratio is it?
Smokem made a valve cover that tied all the valve covers together years ago. There is a picture somewhere on here