Just a few random thoughts
Turbo on the KV- not insurmountable. It becomes 'loosely' similar to an MB engine which was rated at 200bhp ish.
Same basic components, compression likely too high if also seeking some biggish boost. Existing injection system reaching the limit of controlling the fuel.
So add in a decent EFI setup. Different pistons, exhaust manifold, turbo, wastegate, downpipe...
The EX-manifold alone will chew up a fifth of the 5k budget.
Turnkey engine option? Well, sadly a lot of turbo 10v engines got dumped a long while back, and they'd put you in the 200bhp range, unless also adding lots of work.
20v turbo will better provide the flexibility in modifications, plus 'been-there-done-that-knowledge'
Old drivetrain. There's a bit of info recently about the effects of the extra torque at those levels on otherwise standard transmission...
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I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor
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