What turbo should I get?

[glhman]

I actually found a local friend who is selling this one for $200:

The compressor wheel is the Super "S" trim
The compressor housing is the TO4B
The turbine wheel is the Stage III
The turbine housing is the .63

Since this is going on an Omni, I'm assuming that space for the E would be a problem. What boost should I run at the track with this turbo? (I'm a n00b at reading compressor maps)

[mopar2ya]

It should be reasonably efficient to 25 psi, it will make more h.p. beyond that, but less h.p. per psi.

[glhman]

Ok, so more boost than I should run with cast pistons then (what is the max boost for cast pistons anyways?). I guess I need to invest in a 3 bar in the near future then