The Newman's RST CVH cam mate, Robs work does look good he has copied work from very good heads so I think he will see good results.
Nobody wants to wait until 4000rpm for boost because the CVH doesn't like sustained high RPM's, it generates a lot of heat and with our poor cam and lube situation will chew through a cam in no time, also rockers studs like to exit the head at high RPM's and of course general engine wear will be greatly accelerated if you have to spend all your time 4000rpm+, a nice 2500-6000rpm power band is ideal for a road going RST IMO, this is what I aimed for and what I have got and I cant fault it.
For reference I still make 220bhp @ 6600rpm so thats only a drop of 11bhp, not bad for a .36 housing.