I have a 67 with a 289 and i when i had this decision about a year ago i went with the 600 cfm edelbrock. there was a big improvement in power and top end speed, just make sure you have an exhaust that can handle it and make sure that you set the idle mixture properly, mine ran way too rich in the beginning and bogged a lot off the line. good luck!
Jason
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67 Coupe 289, 2 1/4'' pipes w/ Flowmasters
Edelbrock 600 cfm 4bbl carb, Edelbrock Airgap intake
Hooker headers, MSD Ignition system
Next: new tranny, T5 or Toploader
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