Alt upgrade

So I’ve got a 1972 Plymouth duster 340. 4 spd. And I got a 360 out of a 98 dodge ram Non a/c . I want to use the newer Dodge alternator and I have the pigtail that plugs into the back of the alternator how do I wire that pigtail up so it will work.Keep in mind that I kept all the brackets and everything off the Dodge ram on the motor so it now has a serpentine belt.