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300hp at the wheels you’ll be around the 200hp per liter area maybe a bit more. Doable in turbo performance applications but in economy turbo will be hard.

At that point I’d very much start to consider forged pistons-rods-maybe crank. If on pump gas you’ll be needing quite a bit of boost. At that point you at very very lease will need a turbo wheel swap but a turbo better suited swapped in would be best, less you want tiny Garry to blow nothing but overly hot air. Fuel system upgrades, I’d get head work done and matched up on a flow bench, see if the block can tolerate some more bore.

All in all it won’t be cheap and you’ll still be a one wheel wonder since there is no mechanical LSD AFAIK. May be a smart move to get into E85 at that point too.
What about this one?:

 
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