I have a bolt on 89 and just installed a nx wet kit with a 125 shot. I got a set of plugs that are one autolite platinum a26 and was told the higher the number the colder the plugs, do you guys think I should go to autolite platinum a27 as these are tne next set colder? And my timing is set at 14 degrees, with the 6al should I go to 10 degrees or to something even lower?