The correct and best answer is our board sponsor AMES.
However, here is a link to a PDF file for M&H Electric Fabricators which produces several harnesses and battery cables for 1974 F bodies..
http://www.wiringharness.com/PDFS/FIR_2016_Firebird.pdf
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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