Cheers Zman. Going with the 250 jug on a 200 bottom end 'over square', as you said you'd need to machine from the cylinder. It would be important where you take it from in terms of port timing though, and also I'm not sure but I think you'd likely be up for the price of a replate on top after doing such work.
Going the other way is probably easier as in you can have a spacer machined up to lift the cylinder, as long as the ports are where they need to be.
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