hehe... i realise this would be sh!t for circuits, but why not stick a 302 windsor in there... a bloke did it in a 120y at summernats!
i like to hear all these ideas of sticking v8s into little cars. makes me wish you could do unlimited modifications in the junior sedan class . heard good things about 1uz-fe's, anyone who reads street machine will remember a eh ute with a supercharged 1uz-fe under the bonnet, and in supercharged guise it would get 11l/100k round town, making i think around 260rwk - i understand that fuel economy isn't an issue, though it does say a lot about the engine.
castlemaine rod shop sells conversion kits to fit supra boxes behind a blody lot of engines.
i'd be interested to follow the build-up of such a beast, what sort of costs would you be looking at for the engine (1uz-fe and rover v8)... could end up with a few sunnys lying around!