Drive Train Upgrade Suggestions

James Clews said

Get an aussie 265 Hemi six. The latest engine on the dyno produces about 450 rear wheel horsepower normally aspirated and that guy is building a stroker version out to about 290 cu ins and will put out a shed load more hp. They take up so much less room than a V8 and are way lighter.

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Nice idea but probably not practical or economical in this case, cost of importing the engine and trans (better get a few spare boxes haha) would probably outweigh the cost of dropping a 318 or 360 in. Good engines for sure, but probably much cheaper to build a small block in the US and you can have the same grunt with much better street manners.
Are they Chris's engines your talking about?
Is it a custom crank? I don't know if you would be able to get 290ci with offset grinding and boring, maybe honda size journals and thin bores?

I'd go with a 318/360 magnum swap, maybe even a turbo/blown slant if there's one already in the car.