I had an LD4B that I had on my 273 in the Dart. I gave it to a friend when I moved up to a 340. I wish I still had it though. I'm assuming you are talking about an early 340 intake since it comes with the AFB. Hard to turn down a carb. The 340 manifolds are pretty good for stock pieces. I ran a TQ setup on my Dart and Barracuda. Buy both if you can afford it.