hi guys can any one tell me if vt 5ltr spark plugs will run better in a vr 5ltr i have flat top pistons in it and it has a stage 2 cam & memcal & valve springs in it allso a 70mm throttle body cold air intake its auto with a stage 2 shift kit 3.08 dif but i am going to 3.70 it blows black smoke when i put my foot down and i am told that its not burning all the fuel it allso has standard injector are vt plugs a hotter plug and will this help thanks