Is this going to be a track bike? You cannot get insurance for the street on that bike in Ontario. If you insure it as a 250 and the insurance company finds out after a claim that you re-engined it, they won't pay the claim. You may as well just not have insurance and save your money.
Talk to Ken (kneedragger8 as he knows both of those bikes better than almost anyone around hear. He would quickly be able to tell you if it was possible.
Good luck.
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