67-72 rearend in an 81?

[bigcarguy]

I've got a rearend with 3.73's and a posi in it off of a 71 Chevy, I believe, that I had bought for my 72 before I got rid of it. I still have that rearend and was wondering if I could swap the gears and posi out of it and into my 81's rearend. I know the whole thing wouldn't fit since 67-72's had coils in the rear. The build sheet says that I have the standard rearend, if that helps any.