It won't sound REAL unless the lash is .025-.029
As to the manufactures developing new profiles for flat tappet style cams--we dealt with this in late 60s early 70s when I had enough of rollers scattered thru the motor--changed to flat tappet by Howard's and working with them,developed some better grinds that moved us further in front---the limiting factor ( besides valve spring availibility ) was the edge of the lifter hooking on the cam lobe---of course NASCAR runs flat tappets to 9000+ but they
oil them!!!and they use mushrume lifters with a larger diameter