Manley Valve ID Help??

[KnuckleDuster]

Hey guys,
I'm missing one exhaust valve from a set of J heads I picked up, and cannot find a replacement, or ANY info online whatsoever! I have searched and searched...

Numbers and script on the valve are " Manley G954J"

Any info or ideas?

 

[69FBCuda]

Looked for an hour, that alphanumeric returns zilch

 

[CRUZE 418]

Who's going to rebuild your heads? You or someone else? Any shop can find it. Probably want to search the application, not the part.