First, you have the 5.7L not the 4.3L if the distributor is on the front
Those distributors just bolt down , they don't have a timing adjustment... its all computer controlled. If you are having performance issues, scan the computer to see if any codes are stored.
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
See the diagram below for your distributor
Image (Click to make bigger)
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Thursday, September 25th, 2014 AT 6:02 PM