I have motors with just about all of the choices out there . Qjets, Holleys AND dual Edelbrock clones on my 470' 409. Can't say to Cliff's long term issues but 25 dyno pulls tweaking rods/jets as well as lash and timing I think they did OK 
they were not OK out of the box. float levels not even to Edelbrocks specs. A step leaner jets also.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune [email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed
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