A bit difficult to read, I can do a better job over the weekend to clean them up and make the more legible if need be ?
The manifold you asked about I believe reads 3671862-6 in big letters 76 ( maybe )
Another more legible manifold reads 4027567-3 78
What do these casting numbers tell you(?) is the large print ( 76 and 78 ) a casting date 1976 1978
Is there are listing of the various casting numbers for these slant engines that I could see to help me better understand what these numbers mean specifically?