I am under the impression that the factory service manual says they all need to be match balanced. Can anyone confirm or deny this please?

I have changed out five or six, some five cyl, some four and my 280e six. So far the 280 was the only one not neutrally balanced.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.