well pulled 2 deg on stock plug with a 50 shot everything good!! got some ngk tr6 1 step colder plug so i can go to the 100shot but here is where im at gaping? im had mixed review on gap and plug numbers for a stock bottom end with the stock gt40 iron heads im think .30 to .35!! but im been told .30 all the way to.40!!! next ques is about going two step colder on plug i have ngk br7ef but they have recessed electrode and tip i don't know if they will work? need some help on plug number for going to the 100-150 shot? also on the tr6 plugs are the same as the stock plug on the electrode and tip but i was told u don't want to use them because their not recessed electrode and tips?