B- body 8 1/4

1969 first year for the 8 1/4. 70 B-body is only a couple of inches, more or less, wider than the A-body rear so it is a good fit for the A body.

that's what I am fixin to do ...I was going to put it in a duster my moving the perches in a little but my question is: will a 70 version interchange with gears and parts from later ones?

it has 2.76 grandma gears now and I want like 3.55 or close to that neighborhood.