67 Barracuda Heavy Electric Load

Auto Electric Systems Inc in Dallas just got back with me on the alternator. They said the alternator does not put out enough charge at an idle, but it can get up to 80 amps at high rpm’s. He asked for pictures of the mounting area (I just provided) and he is going to quote me for a new alternator that they will put together that will produce adequate charge at an idle.

Am I asking the right questions and does this seem reasonable?