The balance of the engine does seem to have improved, as it idles smoother now.
I am more curious about the effect of the crankshaft sensor and it telling the computer what position the crank is in being 20* off.
Also, under boost this engine always made a rattly noise, I always assumed it was a bad coupler in the SC but since the new Crank sensor and harmonic balancer adjustment, the noise is completely gone.

alkygto - I bought this engine from a junkyard, its a 1999 L67, car is 2003.