I have a account with C & S Specialties. All they do is build carbs.. I can save you a few bucks but be ready to spend around $900 - $950 for a good one. Otherwise you are going to have constant troubles trying to modify a regular unit.
The carb hat can be bought through CSU. Do a Google search for them or look on Turbo Mustangs site for the info..
Good look and feel free to PM me if you need any help along the way.
And yes I thought you were someone else.