Nitrous and head cfm

Episode 13 of engine masters, available on you tube. They ran nitrous on a 360hp 305 Chevy with vortex heads (pretty good heads). Made 200 more hp on a 150 shot, a 250 shot made 619hp, right on rated.
They blew it up with a two stage 300 hp shot, but Nitrous guru Monte Smith (sadly passed away) said it should have survived, and would have, if they had taken enough timing out.
There is a lot more to making power with nitrous than bolting a system on.