340 2x4 intake

The D64 and the D66 are both for 273/318 port sizes. The only difference between them is the D64 was made for the early 273 intake bolt pattern. If that one on Ebay actually measures for the big ports like it says, it's been ported, because neither intake came with the big ports. To my knowledge, Offenhauser was the only one who offered a low rise dual quad intake for the 340/360.