hi every one! long time no see!

i have the task of rebuilding my head now

cause one of my Lifters/Lashes on my Sr20DET (Red Top) Failed when i was warming up my car 2 weeks ago and chewed up one of my Cam lobes pretty good. so here is the List of the Items im buying/ have boughten...
HKS 256 intake Cam
HKS 264 EXhaust Cam
Comp Cams Valve Springs
Rocker Arm Stoppers
Tomei Solid Pivots
Apex'i Cam Sprokets
now i am wondering about my Valve Spring Retainers! Should i replace them? or will they hold 300-350 hp? what is the max HP i can make w/ them? thank you for your help and info...
~nathan