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I am putting a Edelbrock Performer series carberator (1406) on a Edelbrock performer 289 intake manifold. What spacer width, if any would be the best set up. Only other mod from stock is a Edelbrock performer plus camshaft. Other question would be what extras (linkage brackets etc) do I need to get this setup connected to the car.
 
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Not sure how much clearance you have right now with your current air cleaner, but I would think that you would be able to use a 1" Phenolic Spacer. I have one one my 351 with a performer intake and Holley 650 double pumper, and a 3" filter on a sunken cleaner assymbly. There's about 1/4" clearance. The Phenolic spacers are supposed to help reduce the heat more than an aluminum one. In general, your creating a cooler mixture area for the gas and air.
 

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If hood clearance is a problem, try a 1/2" spacer....I made one of these for my D-coder because the stock aircleaner wouldn't clear with the 1" units...

IMO, phenolic is best for its isolation properties...and it's relatively easy to work as well, if somewhat expensive as raw material.

Your Performer is similar to the Cobra manifold I have on the D-coder and I've found the 4 hole style spacer to be the best arrangement for a dual plane manifold.

The only extra stuff I can think of for your application that you might need would be a kickdown bracket/linkage and choke accuator (depending on choke type).
 
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