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i was talking to a guy at work and he got me to thinking about getting a vacuum advance dist. instead of my HEI i have. i'm no buff in distributors so here it is....current dist. is out of '84 z-28 305 (l69) it has 4 wires in one connector and 3 wires out of another connector. (1 may be for my aftermarket tach i installed years ago) what do you guys think about my setup or which way is best. thanks.

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The '84 Z28 distributor should still have vacuum advance, so I am not really sure what you are asking.
Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project
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i don't have an actual vacuum diaphragm thing ON the dist. but i did notice that 2 of the wires that go under the dist. cap are conneted (on the firewall) to a plastic thing that has a hose hooked up to it. from there i'm not sure where it goes. so does that make my hei a vac. advance. noted that the truck came equipped with the 292 v6 ('86). thanks.

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I think you need a non computer interface HEI out of a pickup.
Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project