Comp 901-16 Valve Springs

The guy that does my heads wants to see 300lbs on the open valve and 100+ closed. The 901's spec is 242 at .400 lift. almost there but maybe not quite. Maybe at .470 and maybe not?? I'm building a 90 360 roller with a mild cam (haven't ordered it yet but know what I want) so I need springs to control the roller lifters to 5500/6000??