I run an ac delco 10si in mine. It is internally regulated and can make use of the stock wiring, but you have to make a bracket to get it to bolt up to the front engine cover. I actually run a 10si in the ram50, have one in the 62 falcon thats not on the road any more, and will be running one in the 68 f250 when I get around to that project. All three have a group 24 battery in them too. Fleet interchangeability is convenient.
The 10/12si are produced brand new in really high outputs as well.
Not quite as cool as as adapting a dodge sourced alternator, but it's been trouble free.