These Mounts will move the motor ahead 1 inch One Inch, then this will allow for the H. E. I. distribrator to install with out hittinr the Firewall. I was answered this question in that Classic Checy AKA Eikler had them, this is incorrect, eiklers has something simuliar for 55, 56, 57 NOT 58. I saw the correct mounts in a Catalog somewhere, hopefully I wasn't Dreaming. I need these BAD so as I can get on with the 700R4 installation. PLEASE HELP Thnx-Much VON