Youre ready for new valve springs to start, I would change the head gaskets also. Did my 2000 500EFI's last year at 155hrs...a few springs were sagging although I think they would have made it to 200hrs, but I had a head gasket that would not have made it through the season.
Use Comp 929 or equivelent Isky springs. Fel Pro or Cometic head gaskes. Good Luck