Very rare sbc cross ram  adapter plates to convert the carb manifold to fuel injection.    These manifolds were designed by Chevy for use on the Grand Sport with side draft 58 mm Webers.  Made by MacKay and later  Mickey Thompson.   A couple were converted to fuel injection. One was used on Bruce McLaren can-am car. These manifolds have large ports like the biggest Chevy heads  I am selling the the adapter plates and short horns only, other pictures are for reference only. The plates need to be drilled for butterfly shafts    contact    805 298-3152