340/360 exhaust manifolds

Left one is 3614368 with a cast date of 1-24-73 and the right one is 3418623 cast on 4-9-73.

3614368 is '72-'74 A body 340-360 LH
3418623 is '71-'73 A, B, E 340 RH and '71-'73 C body 360 RH