Where do these plugs go?

Car is a 1974 Duster with a 440 swap and battery trunk relocation. Wiring from the ground up with what I believe is the oroginal (slant 6) harness. Starter relay, ballast and ECU are on the firewall so rerouting all that. This is my first major wiring job and I’m not sure about these two plugs. Any help is greatly appreciated.

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