Why not just drop in a V8 for that money?

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Some of the Holdens had a V8 in them and there was also a V8 with a supercharger on it in a limited edition.
A friend of mine has one of these supercharged V8's that came out of a car that was bought at a salvage auction, he broke the car for spares but kept the engine and is going to rehome it in an Ultima CanAm that he's just bought. The engine has been on a dyno recently and was making just over 600hp and about 375ft/lb of torque with the possibility of making a lot more hp/torque just by changing a couple of pullies.
I'll let you know how things progress with this.
If one of these will fit in a Holden then it can't be too difficult to fit it in an Omega, probably easier and cheaper than modifying the Vauxhall V6 engine when you consider that you'll need Forged pistons to take the extra power and heat produced inside the engine and your cams will need to be reprofiled to work well in a forced induction engine, and would the crank be strong enough to take the extra power ?