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i just realized that i need to replace the vacuum advance on my 84 chev truck. 305. qjet. hei. how easy is it? isnt it similar to the vacuum advance on a points ignition system? as you can tell im not extremely familiar to hei systems...

thanks.
 

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they arent the same, they are similar sure, but you need an HEI one they wont interchange,

they are dirt cheap at the auto parts stores

and simple to replace, two flat head screws holds it down in the base of the housing you have to remove the cap and rotor first of course
 
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