The 1971 Pontiac Service Manual is the book you need to get. You can find them on Vintage Automobile Book websites and sometimes on eBay. Expect to spend $25-$35 for one in good shape. If you plan to work on the car yourself, it will prove invaluable. Most have full color large fold out wiring diagrams for the entire car and all possible engine/option combinations. I just looked under "ventura manual" and found 2 on eBay right now.
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'74 GTO
13.17 @ 104
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