Sorry but it just annoys me, a little, when people have an original question/brief when responses drill more cost into their solution with lots of requirement creep and additional cost for very little gain.
Maybe that's because requirements capture, costing and risk management are a big part of my day job.
I think you have 2 simple options :
1. Just get the headgasket fixed. It would be done in a few days and you know exactly what you have.
2. STi short engine, pinks and VFxx. A cheap way to 330BHP. But runs the risk that the short engine has faults or latent damage. The same could be said for the turbo.
Anything more than that you will be running into the area of depreciating gains and increasing risk.
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