Building 67 fb 428cj, c6 , been putting pencil to steering options, looks like by the time I rebuild unit I got get new steering box, I can buy Randall manual rack, will have to spend extra money on headers to fit rack. How should I go? The 428cj has edelbrock alumn heads, intake, water pump. This brings up another , should I buy big block or small block springs. Im thinking small block with the wieght Ive shaved.