Does an '86 50 oz externally balanced Ford 302/5.0L engine need a 50 oz
imbalanced flywheel AND a 50 oz imbalanced harmonic balancer?

The reason I'm asking is the following. When I bought the vehicle
containing the subject engine, there was a lot of engine vibration. I
looked and the outer ring on the harmonic balancer was cocked so I
started to do research and found that the balancer for an '86 5.0L
should be a 50 oz model. So I got one and put it on, finding the old
one was a 28 oz model. Doing so smoothed the engine out quite a bit.
Later for other reasons, I replaced the flywheel (which I found was
also a 28 oz model) with a 50 oz model. After this, the engine
vibration came back.

So what's the deal? should both the balancer AND flywheel have a 50 oz
imbalance on an '86 5.0L or only one?

Thanks! Dave