340 vs 360 confirmation

Woodsman341 said

After digging, it seems like the matched set 72-73 340 manifolds (and others?) Have a 2 1/4 outlet on the driver's side, 1 7/8 on the passenger side. Is there a matching 2 1/4 passenger side, or does the difference really matter?

Thanks...

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Yes, this is correct. One side is a 2 1/4 flat flange and the other is smaller with a ball socket type flange. Im pretty sure this was the case on the 71's as well. If you want the big 2 1/4" opening on both sides you need to shell out ridiculous money and get some 68-70 340 manifolds.
For a mild street driver I would send the 72-3 manifolds. They flow decent