Well, I just got the new alternator in. I went with the GM 12 si 94 amp 3 wire unit. Installation was pretty simple. The most difficult part was keeping warm. If you are just doing an alternator swap this would be really easy. I modified my gauge pickup harness as well due to my going with mechanical aftermarket gauges. All in all it was pretty simple. I will be posting a review as soon as I make sure everything is right with it and can write it up.