You should scribe a line on the housing even with the front of the stock plate before removing it. If you skipped this step sometimes you can see the screw marks on the stock plate and scribe a line after reinstalling. There is no magic number for the stock position, each engine has been set individually. A very tiny bit of adjustment goes a long way, we're talking a few thousandths of an inch. Slideing the plate full forward is a just a cheap power mod, you may get more power but you can't really use it because your egts will climb fast.