You'll definitely feel the difference if you upgrade to a 750 cfm carb, whether it be the Holley #3310 with vacuum secondaries or the Edelbrock Performer #1411 with mechanical secondaries and electric choke. The Edelbrock lists for around $282.00 and the Holley for around $302.00, including the electric choke, and are readily available at Jeg's or Summit. Keep in mind, both of these carb's are square bore. The Rochester Q-Jet's range in prices from $350.00 to $390.00 which are 750 cfm, and I believe they are spread bore's.