Either one is a direct replacement. Just unplug the old and plug in the new. The only problem I have had with a Factory Fit harness is that one of the snap in assemblies for the tail lights was a very loose fit. It would work great until you hit a bump and then it would lose its ground. Not sure if it was their fault or something abnormal about my car... after 36 years you never can tell.
The shop I "hang" with used Factory Fit/Autowire on a 62 biscayne done recently. What we used was an 18 circuit setup, not specific to any car. The 62 was a complete custom job anyway. We liked the fuse box and the whole "command center" system. Relays, connections, markings, everything in one spot and it was top notch. The install was easy and it looks very nice as well as performs well. We liked it more than the Painless system we have used in the past. Nothing wrong with Painless, but when starting from scratch, this was nicer.
All, thanks for the response. I will try them out and let you all know how it goes.
One other question, does anyone know if their engine harness allows you to hook up an HEI, other type of electronic ignition (I am thinking Petronix to avoid any firewall clearance issues) with out cutting it up.
My 70 SS Chevelle had resistor (right term?) in it that did not like HEI and I understand Camaros of this vintage have the same thing so I am wondering what folks have done to aleviate this issue.
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