I don't know anything about that manifold except the p/n.  That is where I got the info as to which engine it fits.  I may be wrong but if you search that p/n, that's where I got that info.  it was in the trunk of the 55 bird that I bought.  The previous owner owned the bird 43 years......no telling where it came from.  If you want more info., I'll dig into it.