[DanEC]

Going back to your original post, I would go ahead and put the new plugs in. I’m kind of negligent in changing plugs regularly and last year my old 427 Corvette with a bunch of compression, cam duration, etc started running a little off. Finally put some new plugs in it and it was back to its usual self. Friend with a Hemi Roadrunner just had the same experience and his plugs weren’t real old.