Clarification on 70+ alternator VR on 68 cuda

Hey guys, I added an MSD box and am putting speakers in my 68 cuda so I decided a 60 amp should work well. I do not have AC, electric fuel pump, or electric fans. I also have Done the MAD bypass and added a 8awg wire from the alternator to the starter relay. I told the auto parts store that I needed an alternator and VR for a 71 duster 340 along with a female connector to the VR. So just clarifying, all I need to do is splice the 2 old wires from my VR to the new connector I got? I was reading a forum on here that confused me because they said you must add a wire but I don't see where, since both VRs have 2 wires coming out. Also, I'm not looking for a killer sound system, no subwoofer anything, just 4 speakers capable of 125 watts. Thanks!

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