For a bolton unit in this HP range the ATR43SS2 would be a top choice. The price on those is $1250AUD each including braided oil line. This turbo bolton to factory manifold, dump, water, and oil. you will need a proper 4 inches induction pipe and a 2.5 inches 90 degrees silicon hose
Recent result from this turbocharger on E85 fuel as a direct bolton turbo on stock manifold internally gated:
321rwkws @ 19psi
and this one is from using pump 98 fuel, similar setup as above with factory exhaust manifold, internally gated as a oem replacement turbocharger:
If you are looking for around the 260~300rwkws (350~400) mark I would be recommending the SS2.5 or a standard high flow. Those are $850AUD including oil line.