Need some info on what this manifold is from?

Cruze426 said
Seeing this, I would have to agree with you. So, I don't remember my '69 340 intake having larger secondaries, did it? Or has the pictured manifold had its secondaries altered ? I ran a 440 AVS on my 340 with the stock intake manifold, the 440 secondaries are larger, but if you opened the throttle , it would just align itself. Oh well, just saying.
Thanks

I don't know what you had without a picture, but the manifold in question above is a factory unmodified piece. "I THINK" the 68 340 had symmetrical venturi and the 69 and 70 had the larger secondaries, then the 71-73 had the TQ. I do know "there was" a 340 intake where all the holes in the pad were the same, I am just not sure which one it was.