My 92 F250 with a 460 has the stamp E7TE on the heads just below the valve covers. Is this the head stamp? If so how are these different from the E8TE and D3VE heads?

I'm curious as I have read somewhere that the 460 heads were updated in 93 so they are an improved design. My truck was built in December 1991 and I'm curious what the difference would be.

The only thing I have been able to determine about the E8TE and D3VE heads is they have combustion chambers from 93 to 95cc. Other than that I don't know anything about them.