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Seems to have better throttle response and take off with a stock 81.
Took mine to about 14 degs before and no pinging runs great.... it actually got rid of most of my cold engine hesitation too!
#1. This post should be over in the Technical section to get more detailed responses.
#2. Read Lar's posts about timing and tuning and you will have a good running engine. There are some articles in Other->Tech Tips that should help you out.