I see no one has chimed in yet, it looks like a pretty nice set up for the money....but you really have to do your research on stuff like this. I looked at the ebay add and first thing I would do is call Brian and ask him for a few references. If he's got nothing to hide and is on the up and up then he should have no problem with that. Since he does have a dyno he would be the one to ask about a reasonable hp estimate.
Also depending on your application....daily driver, weekender or race car only, make sure you pick the right cam, some guys, well a lot of guys over cam and carb their engines and wonder why it doesn't run right or isn't very street friendly....good luck.