360/340 exhaust manifolds

Hi:
First of all i'm sorry for loosing this info that I had once before.I had the numbers but the manifolds were not handy.These manifolds came from a 71 360 motor in a c body.My part numbers are as follows...#3418823 and 3418621. are they hipo manifolds?What will they fit? Can I use just the passenger side to any benifit,I know the drivers side will not work on my car (early A-body)that has the 273 manifolds still on it,or will this cause an imbalance in the exhaust flow,
or some improvement over the 273's

mike

71 360 manifolds were a completley different animal than the HP 340 manifolds.

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71 360 manifolds were a completley different animal than the HP 340 manifolds.

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No, not exactly true, the 3418623 RH side and 3418621 LH were the same for (some) 71 360 C-body's and all 71 340 B&E body cars.

The 71 A-body 340 used 2863553 on the LH side and 3418623 on the RH side.

The castings you listed above (351) are unique to C-body but I don't think 3418823 is a good number, I'll bet it's 3418623?.