Still has a stumble/hesitiation

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I had similiar isues like you I put a holley 770 street avenger on and its a new world now, has vac secondaries.
 
TEKSLK has hit the nail on the head!
Get rid of the Demon carb and put the 770 street avenger or even that 3310 that you were eyeing. You will get instant results s traight out of the box.

Regards
Billy D...
 
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