What would you guys do? I have internally stock 350 edelbrock rpm intake edelbrock 600 carb only changes. I want to rebuild a motor. Should I take this out and rebuild it or should I find another motor. I could probably get my hands on a 400 sb for fairly cheap. What should i do? Im looking into the 450-550 horsepower range. My th350 and my 12 bolt posi should be able to handle it. What would you do?

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Get the 400!

Bigger is always better. And I'd take the 400 over trying to stroke your 350 :D