1975 Plymouth valiant stalls in gear when hot

Ok figured it out, I had a wire under the dash that came unplugged from a crimp, doh! Car runs again. Now with the MSD ballast installed (with some jumpers) I’m getting 6.5v at the coil while running. I’m not sure if it’s because I just jumped the 4pin plugs to a 2 pin style that killing the last of my voltage so what wires so I have to keep/get rid of to clean it up? See photo

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