Yep. The 390 is a 4150 that can be converted to 4160 specs. (4150-8007) The carbs and conversion kits are available at Summit and PAW in CA. Though it is a NASCAR carb, it means NASCAR approved for use in certain classes. The carb I'm quoting has air valve secondaries and an electric choke. Would be a good setup for an Offy and a little more cam.