Information wanted

[gunmetal]

I'm getting ready to pull my tranny for a rebuild, while its out I'd like to see about doing something with the heads.  What I need to know is what heads are on the car now.  All I can see is 89A and a couple of clocks (if thats what you want to call them).  Heads are still on the car. Can anyone tell me what heads these are?  I was told H heads but I've never heard of such a thing.  340 engine.

[gunmetal]

Couple photos

[Moparal]

No, you got more numbers on the heads...keep looking

[gunmetal]

No markings at the plug, nothing on the front of the head either. Any thoughts on where to look?

[Moparal]

look towards the ends on the inside, up under the covers. You are only showing the middle.  You have casting numbers and service numbers there somewhere

[Bullitt-]

Numbers on my sb heads are to the left of center just right of #1 cylinder, #8 if your on the passenger side.

[Chryco Psycho]

look under the intake ports if you have the intake off