Old Chrysler Parts

My dad just got a '55 chrysler windsor deluxe, and his passenger side exhaust manifold has a crack in it. im trying to find a replacement manifold or a set of headers for it (it's a 300 or 301 engine.) if anyone knows a place where i might find 1950's mopar/chrysler parts please respond! thanks!

is it a 331 red ram? the engine