Howdy all. I have a set of leaf springs for my 76 swinger. They have a good arch to them compared to two other sets i have, so im just going to rebuild them. One is a 5 leaf and the other is four. Since i will have them apart, i figured i would add a leaf or two. Question is what should i do make them; six and six, five and six, ???. Mild 360 with od 4 speed. Thanks