Surprised me too. I thought the 340 AVS intake was great, but then looked up the other part number. I've got several 340 intakes, but gave my old LD4B I had to a friend for his 318 about 30 some years ago. I got rid of the 273 and 318 parts when I started collecting 340 pieces in the 1980s. Now I'm going back. Since NHRA defactored the 273-235 down to 210 HP, and we get the LD4B, it should run pretty decent. I figure it will take about 350 HP to get the Dart down to 12 flat (-.70 under). Seems like a lot to squeeze out of a 273. Maybe 300 HP to run the index, so need more than 300 HP to qualify.