First off, I don't think you would be getting a Litens pulley in that package, because the lowest retail price I've seen for the pulley alone is $50 + shipping. And I'm not aware of anyone but Litens making this ADP for our vans. I bought the Litens pulley and built a homemade version of the tool which worked out well, but I can't imagine anyone selling the commercial tool plus pulley for less than $100.
Next, I've never seen anyone post that they replaced the pulley with the alt still on the van. It may be possible to do so, but there sure isn't much working room. If anyone has done this successfully, by all means please post!
Finally, the alt for $140 almost certainly doesn't have the required ADP pulley. There are lots of reman alts being sold which not only don't have the right pulley, but are rebuilt by 10 year-old Chinese kids who are paid next to nothing for working as fast as they can. Ask your local Auto Electric guy what he charges for this work (Litens pulley + alt reconditioning). Made in the USA