Under the heads on the piston side there is this:
B 11 302 D00E
69

Under the valve covers there is this:
a circle the size of a quarter with L6135 and 302

Does anybody know anything about these heads and if they are worthy of doing any machine work to them. Or where I can get some info on these heads. The guy who gave them to me said they were 1969 302 high performance heads...but I dont know.
They have big intake and exhaust valve in them, look close to 2.02s and 1.69 by my ruler.