Will Rod swap require balancing?

its still hanging on the wall. Old Model 690. Its as big as a lunch box. That model has been NA since about 1980, the new 690 is half the height, "modern components inside" makes sense when they can put entire control boards on a chip now.

LOL...have one on the shelf and it works. In fact, I tested it against an analog MSD 6 and the Mallory kicked its ***. Wasn’t even close.

I keep it around because I might use it on my car some day just to piss people off.

That new 690 box is just an MSD 6 with a Mallory sticker on it. I pass on that stuff.