that's a centrifugal supercharger - basically a belt-driven turbocharger, which explains the poor power graph. Definitely not an Eaton unit.
Omega engine sound up to certainly 300HP if certain precautions are taken regarding coolent temperatures and the oil system.
ide be happy up towards the 250/300bhp mark, i havent the time to break about changing engines, if found a eaton unit that may do the job but it has more than 0.4bar boost so thort it would do more damage than good..
& atmo centrifugal ones are pricy but are kinda bolt on/bolt off if it doesnt work etc...
other option i was looking at was just after the manifolds on the bend of the downpipes before the cats was fitting 2 turbos & running the pipes back forward for the air intake... i know turbos run at best directly/close as poss to the manifold but by running them further back ide have a little bit of lag but hopefully bit extra boost & not enough boost that would damage the engine..??
i mainly wondered if anybody knows of anybody with the steinmetz one fitted..

if i was going down an engine change route ide just go & buy a 2.0 16v omega & chuck the turbo unit out of a astra/cavy/calibra etc etc in to it atleast it all be kinda simple plug & play...