Have heard a lot of very good reports from people who ordered their Speed Demon carbs from Don Gould
www.4secondsflat.com
Don has been building carbs for all sorts of high performance street and race cars (track and drag) all of his life and knows motors and what makes them go. When you order a carb from him he wants your car specs (weight, motor, cam, cam duration at .50, etc.). He offers and recommends his "optional service" of tearing down the new carb and putting it back together again, along with setting it up for optimal performance on your motor. He will also speak with you over the phone during installation (or your mechanic) to give recommended distributor and timing set points for the motor. He has never had a Demon carb that HE has set up, go back to the factory for warranty work. I am ordering one from him for my 302, once I determine which cam I'm going to mate with the Trick Flow heads I'm ordering. Good luck! Rick