I currently have a Holley whatever carb on my 390 AMX, R4B manifold. It leaks here and there staining my manifold. I am thinking about changing to one of the Edelbrock carbs, perhaps a performer. Is it a simple bolt on and go? What adjustments are needed if any. As you can tell from this question I am not that mechanically inclined. The folks I normally have do this work live quite far from me so I would like to do this if possible. And I was also thinking of putting on an Edelbrock polished manifold as well, how difficult would that be?