Is this turbo too big?

There is no such thing as too big of a turbo, just too small of an engine. :D
A friend told me that with a giant turbo on this 406 chevelle. Just wanted to say that, sorry not much of a turbo guy.
 
It is not at a bad price most I see are more expensive that that. They have a pedestal oil feed and the exhaust flange is missing.

What size engine would that be good on (remember gas applications!).