Hello again.
The diagram I attached earlier was specifically for a 1987 Caprice with a 305 ci engine. Our guides are limited on diagrams and information for pre-1995 vehicles. I searched the internet and found a few other vacuum diagrams that might help and attached them below. Hope this helps and thanks again for using 2CarPros. Happy Holidays.
Danny-
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Wednesday, December 30th, 2020 AT 9:05 PM