What you have is the C8OE-F cyl heads. The C8OE-D cyl head was used on the late 289s and would have 289 cast into the head vs 302. Also my reference book, "High Performance Ford Engine Parts Interchange" by George Reid states that the C8OE-D head is an emissions head. It would have ports cast into the head near the intake for the thermactor plumbing to thread into the head. These would be quite obvious and would need special plugs inserted in there to plug them off. From your pix, you don't have them. These heads also have large combustion chambers at 63cc for low compression. They were only installed on California bound cars. (These would make good door stops, aren't you glad you don't have these?)
Your heads C8OE-F are some good ones. They were cast for 4 barrel carb use and have small combustion chambers at 53.5cc. These are some of the smallest comb. chamber heads that Ford made for the small block and I would consider them high compression heads. Comb. chamber size is on par with the 289 HIPO as well as the port and valve sizing .
Intake valves are 1.78", exh. 1.45"
Int. port size 1.94"x1.04"
Exh. port size 1.24"x1.00"
These heads did not originally come with hardened exhaust valve seats for use with unleaded fuel.
These heads were made for use with rail type rockers. If you don't use these type rockers, you'll have to use pushrod guide plates and threaded rocker studs to attach them to the head. Otherwise there is no provision to keep the rockers centered on the valve stems.
You have some hard to come by and desireable stock heads. The code 7J2 indicates the casting date, Sept. 2, 1967. Cast at the Cleveland foundry.