Can add a little more info on these exhaust manifolds.
3418623 is the casting number on the manifold.
3418624 is the Chrysler parts catalog part number.
The above numbers are right passenger side manifold.
2863553 casting number
2863552 Chrysler part number
These manifolds are left drivers side manifolds.
Chrysler superseded the left drivers side number to:
3614368 casting number
3614367 Chrysler part number
Here are some photos of the right manifold and the superseded left manifold.
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An interesting side note.
Between 1980 and 1986 Chrysler tried to sell off slow moving part numbers in their national and regional parts warehouses.
One of those numbers was 3614367 which was priced at $102.00 in 1981.
In 1985 the price was reduced to $8.33
The reduced special price sheets were sent to all Chrysler dealerships every 6 months during this time frame.