Having trouble with my 72 Challenger 360 engine.. key buzzer goes on.. all lights work, seems to be plenty of battery power.. sometimes I would hear a click, or spuratic clicks, then i would try it again and it starts fine.. now i get no sound or any responce.. turn the key to start and nothing.. doesn't seem to be making it to the starter, I have one of those tiny replacement starters in there now to fit in next to the headers i put in.. the original was just way to big.. anyone know where i should look or advice.. thanks