well ive been putting money away for sometime now and i have enough for ether some 1.75 roller rockers or a underdrive pulley but i have concerns with both

25% underdrive: since i made the switch to hydro boost do i really want to turn the pump responsible for my brakes turning slower...

1.75 roller rockers: i have yellow ls6 springs installed and juat need time to install my 02 ls6 cam. since the cam has 0.551" / 0.547" int/exh lift with 1.7's by adding 1.75 rocks it brings my max lift up to .567/ .563 and ive read that ls6 yellow springs have a max lift of .570, is running that near to max lift safe? (mAX RPM 6300)

what do you guys think?