RM 265 that much better than a 250?

Is a rebored, and replated cylinder displacing 265cc all that much better than a stock 250 which is used mainly in the woods????  One of our races which I won was sponsored by a plating company, and I won a free replate, provided I purchase the piston, and gaskets from them. I was thinking, why not just get them to bore the cylinder, and replate it to match the largest size RM piston available

Port openings actually become smaller which also changes the port timing. Velocity does pickup which means a small improvement in low end response, but mid to upper suffers. Now being that it's for woods riding I'd go with it after checking one item. The cost of replacement "overbore" pistons. 

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