Are these 340 ex-manifolds?

What Im saying is a cast iron 273 is worth $$ to a 273 #'s guy. Just like a cast iron 340 intake is worth $$ to a 340 #'s guy. Dont know much about 273's, but the LD340 is worth more than cast iron 340 intake all day long.

Oh absolutely. It all depends on what you have as to what it's worth. I would go so far as to say the LD340 is worth more than all of them, especially one with Chrysler part numbers cas into it. I would go even farther to say that it is as far as I'm concerned better than any dual plane available today. Even the sacred Air Gap. I think they flow that good.