Bob,
I don't recommend that you use 456 for any new recording. It is the worst of the bunch in terms of developing Sticky Shed Syndrome. My extensive experience baking tapes for people who find that they have committed their music to this tape indicates that the problem was never fixed. In other words it affects 456 from all eras right up to the last production runs. Why would you record something to it when the likelihood is so high that the tape will develop problems?