I need Cyl Head Identification Help

[SCHWANGAU@aol.com]

I inherited an 11 bolt, 6 port cylinder head for either a Spirfire or Herald.
 The number in the casting is 304955.  Can anyone identify which motor and
year this is from.  I am trying to find some one who needs it, but I do not
know exactly what I have.

If you have access to Triumph Standard parts books and can look this up for
me, I would appreciate it.

It appears to be early Spitfire, but has uses 11 studs, instead of just 10.  

Thanks.

Brian N

79 Spitfire
65 Spitfire
59 Bugeye
63 Consul Capri