how to tell what a-833 i have

there is a pp83 5246 the 6 might be an 8
and the big number is 6b150645
the pp83 might have another 3 but it is not very clear
Now i think it is an overdrive unit becouse the first shifter lever the one by the bellhouseing is upside down
Can i take gears from a b-body four speed and put them in my a-body if i need to