Oh, one additional note concerning the thought of using the LS2/3/7/9 coils on an LS1/6 ignition system. The plugs on those coils are different, too. The older coils have a rectangular plug where the newer ones are more oval looking. There are individual adapters available for each coil (8 needed), or you can get the two harnesses (one for each bank of coils) as the plugs that the two harnesses themselves plug into are the same for both style coils.
As for the dwell timing issue, it appears that the dwell for the LS1/6 coils is longer than for the LS2/3/7/9 coils, so without changing the dwell in the tune, you run the risk of early failure of those newer coils just plugged into the LS1/6 system.
But that being said, it appears that some people have gotten some noticeable torque gains by increasing the dwell timing. But as mentioned, this could shorten the life of the coils as a result. So it could be that some people who claim to have gotten HP gains by going to the newer coils are correct, but the life of their coils might not be what they will appreciate much.
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