correct exhaust manifolds

the first two picture are factory a-body big block 2863900. It has a longer down leg to the b-body b/rb hp manifold also a quick tell tale is the casting number is on the front leg not in the middle. On the car is the b-body manifold and when I get the correct engine back in the car the correct manifold will follow. lol I'm just having to much fun driving it right now! These are 67's the left side 2899002 is different for the 68-9 they flow a little better. I think all right side manifolds are the same all years all big blocks including the 440 M-codes.