There are lots of opinions out there just wondering why you want to change intake and carb? Q jets are very good carbs but difficult for some folks to build and or tune you can get decent mileage and performance from them. CFM range from 600 to 870 or so, Holley is very easy to tune and set up and build they have very good performance but economy will be less than a similar sized q jet. Personally I dis like the edelbrocks/AFB, They can have outstanding performance but setup is harder than a holley and require much more attention on daily drivers. primary metering is held by vacuum on metering rods through a piston setup which can carbon up causing it to run rich at idle and low rpm. Or lean up high depending where the piston gets stuck. but there are folks who have great success with them. If you are not planning on upgrading cam, exhaust, maybe heads why change carb and intake? sit down and plan your mods, where do you want the vehicle to be/do. Daily driver, auto cross, street strip or all out race, then plan mods. Personally I feel I get more from a good exhaust on a stock or mild engine than carb and intake. Again just an opinion, what do the rest of yall think?