Gordon, If you were hauling that rig with the original SS sprockets either the 16/47 or 17/49 will be welcome change, however, solutions are close at hand. Yes, changing the CS sprocket should be done when the clutch is already apart. On my SS I went 18/47 to reduce rpms but did it when I did my Rupert Ratio clutch mods and everything was apart already. Call me someday when you have time about the TSMR.
To try and add some information to this thread (sorry for the steal Bola)
Here's a pic of a generic 1 pitch offset link.
Count the pins....there's an odd number....that's what the offset link does for you.
Now if you're to believe the chain manufacturers (which I tend to do ) the double (2) pitch type of offset link has the same rating as the chain it was made for. The single (1) pitch like the one I posted has only 35% of the chain's rating.
I'm using this one on a Victor....it'll do and ended up being a GREAT fit to the chain I picked out.