I believe it held all wiring up that side of engine. Alt, coolant temp, vac line, our 67 273 commando has the same clip. Hard to see amongst the mess.
BTW, what on earth is the long "clip" for on the cover, was it to hold the fuel line?
I read somewhere it was to protect the wiring harness from the exhaust crossover and choke well on the passenger side.
I might be mistaken....