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Like I said before, the HP 383 and the HP 440 used a different left manifold.

The 3418352 is the part number, the casting number which is what you need, is 3418351. On a lot of Mopar stuff, the part number and the casting numbers are one or two digits off. I have a pair of NOS 906 big block heads in the original boxes and the last 3 digits are 904

The 70-71 HP C Body 440 manifolds should fit. The left C Body 70-71 383 HP manifold won't interchange with the 440 manifold. You must have that 70-71 HP 440 C Body left manifold. Then TTI from there.