I'm a little confused on wheel backset. I'm working on a 71 Nova and am looking to putting Cragar SS on it. Looking in Classic Industries Nova catalog a large majority of the wheels are 3 3/4 backset. I purchased a set of 15x8 with a 2" backset off of E Bay. If 3 3/4 is what the car calls for, and I'm not sure that is the case, what will a 2" backset do and will I be able to use these wheels?