Have we done this before? Bigger Engine.

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Bit of a dull week at work has got me thinking. I don't want to start the "Don't go there/get a 5.0/give it a tune" type debates because we've all seen them.
Thing is - what size lump could you get in a Chimaera without cutting up the engine bay or bonnet. You see I don't ever see me selling my blue rocket but I guess over time the lump will get a little tired and it could come to the point of renewing it.
Plus the fact a badge on the back saying 'Chimaera 760' would look pretty cool!
So my somewhat straight forward thinking goes like this. I have heard in the past of 'small block Chevy' engines, now I'm guessing by this they mean a compact type engine, and if they are compact how big CC wise do they get and would one fit?
If we've done this thread before just post a link and I'll go away quietly but I can't find anything in the search pages.