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they have notoriuosly bad grounds that cause all sort of electrical gremlins.

If you paint them up and not make an effort on the grounding all makes and models will have you
In your case make sure the tail light housings are grounded well or you'll be pulling them back out also..{there was a dedicated ground strap on the left,rear tail light housing not the right}...

Anyhow,the factory obviously saw an error in their ways and added the engine strap after a year or two past 70...If it bothers you add one back there and keep the grounding point low on the firewall so you can't see it...Unless you plan on having someone with a mirror climb in there at a show and cry foul on you...