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Irv....your choice of a carb is based primarily on your use of the car and the mods you have done to the motor. If you have a 500+ hp big block, a Holley 4150 may be a better choice. If you are running a mild motor in your car, there is nothing wrong with a good running 3310 type. As said earlier, vacuum secondaries are very street friendly. The Holley 4150 carbs are little more flexible to modify than the 3310's. Good luck.