yeah 290cc should work , but depending on where you live you may push them to their limits at high rpm.. so maybe a little bigger than that plus lean means boom so better safe than sorry
Dave and Jamie are right 290's will more than suffice for up to 8 psi no problem and would be way easier to tune than the 440's which would be complete overkill and you would easily be able to keep your stock fuel pressure regulator as well
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