Personally I wouldn't choose a GTX wheeled turbo.
GT3076 is fine but possibly a small framed Hypergear with roller bearings to get the better transient response would be a winner.
IMO 270rwkw ish on pump fuel for a Stagea is plenty without too much penalty down low.
If you have a TS manifold and can get a suitable TS turbine housing then you should have gains low down.
At the top end the divider might cost you a little.
I would go for the TS housing since you have a suitable manifold and enjoy the better response.