My input would be that those dynos are about 80% at best. The turbos will work on your engine up to 350 HP range max if that map is correct...300 is more like it. However, since it is "hand drawn" I would not trust it and would look for a garrett map.
Next, junkyard turbos are great; I have done three different junk yard turbo build. Most people on the internet today talking about turbos know very little about them, and..... Last piece of input is that most people "overturbo" an engine, so for best results match everything well.