D16 Head work question?????

I want to build my SOHC VTEC engine and i was wondering if it is absolutely necessary to replace my valves, spring and retainers when i get my head built?? I have a 99 ex with 34000 miles on it and I'm not gonna modify my ECU to raise my red line or anything im just gonna go mostly NA with a Little bit of NOS.....and also, does anyone know what kinda compression i should be running with the mods i've listed above?