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If using the usual alternator conversion kit that utilizes a NAPA unit I would recommend spending the few extra bucks and getting the NAPA Gold unit. It is probably not rebuilt to any better standard than the lower priced units they sell but it does come with a lifetime guarantee and I went through several units before finding one that worked. The regulator went defective on one and the front bearing on a second failed in short order and I took both back for replacement.
Whereas I used the NAPA unit on my wife's 3000 on my 100 I have a Leece-Neville (Prestolite) 75 amp alternator with a voltage regulator that is mounted on the outside of the case and thus is more easily serviced, not that I have needed to do so in about 50K miles of driving with it. It did require fabricating a mount but that was not too difficult.
Whereas I used the NAPA unit on my wife's 3000 on my 100 I have a Leece-Neville (Prestolite) 75 amp alternator with a voltage regulator that is mounted on the outside of the case and thus is more easily serviced, not that I have needed to do so in about 50K miles of driving with it. It did require fabricating a mount but that was not too difficult.