Which intake for AC

an old timer told me that the LD340 intake was just an aluminum version of the 1970 340-4 Intake.

I just bolted an RPM Air-Gap intake to my wifes 75 Duster 360. The bosses for the factory A/C compressor lined up (it was taped for a smaller bolt which was no biggie) and clears under the hood with a Holley 650 & oem air cleaner.