RHS head valve train??

sounds like beehive springs would be cheaper than new rockers. I looked up my paper work on these and the springs were good to 570 lift. not sure of installed height or pressures. I would like to run a solid lift cam close to the 570-580 that Brian has reccomended in other forums. Any recommendations on part # for these springs and retainers. Do I need to machine the seats down, if I switch to the bee hive springs?
Thanks for the info guys,
T.J.