2000 scrambler 400 4×4 engine build

So I am looking for recommendations as to what to do with our scrambler 400 build. I got a quote to build an engine for my sons ATV from RCR at just over $3000 for a 446cc big bore stroker with all the trimmings. It will cost right around $2000 to do a complete "stock" rebuild with clutching and pipe kit. In your opinion is it worth the extra $1K for the 75cc and double the power. I’m leaning in one direction already but looking for opinion. This is a "what would you do" kind of question. Thanks in advance.

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