what 340 did that come off of? doesn't look like any 340 air cleaner that i remember..
1968-69 340
1970-71 340
1970-72 340, 383, 400 and 440 4-Barrel with fresh-air hood for B-body
1972 340 4-Barrel. Has flap in floor that opens at full throttle to allow more air in.
1973 340 4-Barrel. No flap in floor. Originally I thought the 1973 models used the flap but I've seen more and more without it. If anyone has a true survivor car with either air cleaner, I'd like to see photos.