'55 oldsmobile heads

If got a mate that has the following problem.
Last Year he took of the first head of his engine and put some new valves and valvegides in no problem 2 weeks ago he took of the other head and the valves and valvegides at much to small.
Can anyone tell me with the casting number on the head which sort of head Year and so on.
Casting number 567322cfd301.

John

 

The '55 heads have an "8" cast on the center exhaust outlet. See picture. Sorry I can't take off a valve cover (health problem) to check the casting number.

 

thanks, anything on the casting number in one of you shop/ interchange manual??

 

Try this site, a lot of data available, can't be sure it has what you're after though.

http://www.oldsmobilewiki.com/index.php?***le=Category:Top_level

 

I have taken a look at the site a lot of information but not the headcasting numbers from the older heads but we found information where we can go further with.
Thanks