I've got the casting #. They r as follows.
Inside the valvecover area e6ae w/6a26 on the outside on one head,
F6de inside w/7k27 on the other.
After doin some checking, i think the one was cast in'86 while the other cast in'96.
I'm alittle concerned because i heard that pre '95 castings were known for cracking.
I dont want to bolt them on and have issues. This is my dd and once it gets pulled apart im stuck till i finish the job. Plz help, thnx.