Found some J heads but not sure they are worth it for rebuild here are some pics of them. Casting # 3418915, Not for sure if the valve seats look good or beat up to much. Let me know what you think, thank you.

 

There were three versions if you will of these heads. The 1st was on the 340 TA cars in 1970 only and they came with 2.02,1.60 valves. The 2nd was also a 340 in the years 71-72 and they came with 1.88, 1.60 valves and the 3rd was on 360 engines between 70-72 with the same valves as #2 on my list.
Hope this helps bro.

ps: Did you buy them yet ? I would definitely get them magna-fluxed etc etc and then you will know what to do. keep us posted.

 

No i did not buy them yet the exhaust port on the far left looks like its into the intake valve thats why i posted them, The person said they were magna fluxed already and said he has a reciept for them.