I have a 426 kit, 12:1 compression, xr400 cam, port&polish,larger intake valves,3-angle valve job,full fmf exhaust, and rev box. I want an aftermarket carb, and I would like some comments on some carbs you folks have. I heard the FCR41mm was good but I saw some modified 400's using the FCR39mm. Let me know thanks!!!!!!!!