hey i workin on an old 1990 ford ranger 2.9 and the thing was torn all to pieces and the battery cable on the positive side has a ground where does it go

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1990 Ford Ranger 4x4, 2.9,V6,lifted,stock wheels,engine bored 0.40,heads shaved 0.20, crank cut,totally restored everything new,and DAMN wat a fortune this thing was. Now i want to do a Bronco 2