I have an Olds 54 98 two door hardtop. Just bought a 56 324 motor, or so I;m told. My question involves intake manifolds I have two. One is casting number 567184 and the other is 563966. The latter looks like it might breath a little better. What is the years for each? Some searching would lead me to believe the 563966 is appropriate for 55 and 56. But don't seem to find anything on the 567184. Probably go with the one most appropriate for the car. They look quite a bit different amazingly enough.

Thanks,

DZ