the 45 angle of the V (the decks) are on paper .745" taller on the RB so the lateral (sideways) increase would be .527" on each side. The vertical height increase would be .527" also. As you know this would vary slightly due to stackup of tolerances/head/deck milling/head gasket thickness but this number would put you pretty close to the change you would need to allow for for ex pipe changes etc