Which Carb for the Spring

I have a Holley 3310 750 on my 383 and it, like every Holley I have ever run, has been a set-it-and-forget-it carb. Once it is dialed in it is done on a street car. I have heard good and bad things about the demon carbs (even here on these forums) but I have never run one. You would be good to go with a 650. If you are looking for low end torque and are not so concerned about high RPM horsepower put it on a dual plane intake.