some engine shake in 5.0 1993 -- Need some help

Need help on this one, I had engine rebuilt a few years ago and it has a
slight shake it did not have before the build.
I changed out the harmonic balancer, a year or two ago and the shake
diminished a lot but it is back now even bigger.
It seems to be just the engine, if it warms up for about 20 min the shake
diminishes. This is on a 1993 5.0.
Also it seems more apperent in 2nd gear.
is it possable the harmonic dampner they put in (stock) was old NOS ??
where the rubber has moved ?
Does the engine need rebuild, or new Harmonic balancer, perhaps a
performance Harmonic balancer?
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