[Cobra R...anger]

I am very very confused, i have been told that in E7TE the "E" equals "8" as in 1980 and the 7 next to it makes it 1987, so far this idea was making sense to me until i started taking apart what i thought was a 1985 H.O. 5.0, now that it is apart i have checked the block, pistons, heads and crank, all of which have E7 codes, does this mean i have an 87 block with 85 carb and accessories, or did the 85's come with e7te parts? I need help so that i can get the right parts to put it all back together now, thanks for any help