Alpha one upper housing question

[spareparts]

Alpha,s didn't come out till 84, they were preceded by the MR1(basically the same) from 82-84 in higher hp applications, and the MC1 82-84 behind lower hp, 82 and earlier on every thing. If you have an alpha, its been swapped(common swap) , look at the end of the prop shaft and see if it has an A stamped on it(not allways but sometimes)