SB Dual Plane Intake Manifold

I am looking for a dual plane intake manifold for a a freshly rebuilt/warmed up 340 (street motor). Used is fine as long as it's in good condition. Am willing to purchase one but am also very willing to do some horse swapping/partial horse swapping for items (with much more to come) I have listed in the "For Sale" section. So, let me know what you have. Thanks in advance.