the throttle cable & bracket are specific , as well as the return spring bracket , you have the vacuum carbs as per factory or the 3 mechanical carbs with the fuel lines on the drivers side ? If they are mechanical you will probably have to make fuel lines unless thay are on the carbs . Air Cleaner ? Center carb is 61-62 jetting , maybe 78-80 for the 500 cfm carbs ?
Roseville or Mancini should have what you need